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Kensington Expert Trackball Mouse (K64325), Black Silver, 5"W x 5-3/4"D x 2-1/2"H

4.2 out of 5 stars 9,554 ratings

$58.00 with 39 percent savings
List Price: $94.99
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Price $58.00
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Style: Wired
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About this item

  • Large 55mm ball design and Diamond Eye optical tracking for precise cursor control; Patented scroll ring lets you scan up and down pages with ease
  • Detachable, ergonomic wrist rest supports hand and wrist for improved comfort; Ambidextrous design
  • Customizable 4-button design, scroll speed and cursor speed via *KensingtonKonnect software. *Windows ARM-based computers are currently not supported. Please check back for future updates on compatibility
  • ChromeOS user can get HID functions for a trackball but will not be able to customize their device through KensingtonKonnect.
  • Wired USB-A connection for reliable connectivity

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Comfort no mouse can match.

Navigate with greater comfort and precision while saving valuable desktop space with the Kensington Expert Mouse Optical USB Trackball. Its optical technology delivers precise cursor control with the touch of a finger while the two-button design provides an interface that’s familiar to mouse users.

  • KensingtonWorks lets you customize all 4 buttons, set cursor speed
  • DiamondEye optical tracking technology for premium cursor control and accuracy
  • Patented Scroll Ring lets you scan up and down pages with ease
  • Large 55mm ball is designed as a perfect sphere to provide exceptional precision
  • Detachable wrist rest supports hand and wrist for ergonomic comfort
  • Reliable wired USB connection
  • Kensington worked directly with Microsoft to provide professional-level solutions that look as good as they function, so you can work like a pro
  • Windows ARM-based computers are currently not supported. Please check back for future updates on compatibility.

What's in the box

  • Kensington Trackball 4-Button Usb Expert Mouse
  • Detachable Wrist Rest
  • Product information

    Technical Details

    Collapse all
    Wireless Type ‎2.4 GHz Radio Frequency, 802.11abg
    Number of USB 2.0 Ports ‎1
    Brand ‎Kensington
    Series ‎K64325
    Item model number ‎64325
    Hardware Platform ‎PC
    Operating System ‎Windows 10, Windows 7
    Item Weight ‎11.8 ounces
    Product Dimensions ‎9.75 x 3.5 x 0.1 inches
    Item Dimensions LxWxH ‎9.75 x 3.5 x 0.1 inches
    Color ‎Black Silver
    Number of Processors ‎1
    Computer Memory Type ‎DDR3 SDRAM
    Power Source ‎Corded Electric
    Voltage ‎1 Volts
    Batteries ‎1 12V batteries required. (included)
    Manufacturer ‎Kensington
    Language ‎English
    ASIN ‎B00009KH63
    Is Discontinued By Manufacturer ‎No
    Date First Available ‎July 7, 2004

    Additional Information

    Customer Reviews
    4.2 out of 5 stars 9,554 ratings

    4.2 out of 5 stars
    Best Sellers Rank

    Warranty & Support

    Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
    Product Warranty: For warranty information about this product, please click here. [PDF ]

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    Kensington Expert Trackball Mouse (K64325), Black Silver, 5"W x 5-3/4"D x 2-1/2"H


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    Product Description

    The Expert Mouse Wired Trackball is the ultimate productivity enhancer that makes working at the desk quicker, more accurate and extremely comfortable for your hand and wrist. Featuring DiamondEye technology, the trackball uses optical tracking to precisely follow small flecks embedded in the large 55mm ball to provide smooth, accurate cursor control. The four buttons are customizable using our highly intuitive KensingtonWorks software, while our award winning Scroll Ring lets you quickly scan up and down web pages and large documents. Add it all up and you get exceptional comfort and ease-of-use that has set the industry standard for more than 20 years.

    Customer reviews

    4.2 out of 5 stars
    9,554 global ratings

    Customers say

    Customers find this trackball mouse to be a high-quality input device with programmable buttons that are well-located and easy to customize. They appreciate its comfort, noting it's easier on the wrist and causes no pain during use. The functionality and motion receive mixed feedback - while some say it works well and moves smoothly, others report issues with the scroll wheel being jerky and the ball requiring more effort to move. The size also gets mixed reactions, with some praising the large ball while others find it too large for practical use.

    931 customers mention "Quality"718 positive213 negative

    Customers find the trackball mouse to be of high quality, with one customer noting it performs better than ergonomic alternatives.

    "Kensington has always been a great product. It might be a little pricy but well worth it. I saw other reviews saying the battery life is very short...." Read more

    "...you're not a hotkey maniac like me then I would say that this is a great mouse, but since I do encounter the problem stated earlier quite often I am..." Read more

    "its a good product... i have used a 'Logitech Marble' mouse before... i'm a big fan at that trackball mouse since its so convenient and nice fit......" Read more

    "...It's simply not built to a standard befitting the price. It feels cheap, it functions like a cheap product, and to be quite honest I don't think it..." Read more

    466 customers mention "Button programming"360 positive106 negative

    Customers appreciate the trackball mouse's programmable buttons, which are positioned perfectly and offer advanced customization features.

    "...With the programmable buttons, this makes it easy for me to have a right and left hand mouse at the same time, which is great for my carpal tunnel...." Read more

    "The tracking on this device is precise and programmable… I have dual displays and routinely have to snag screenshots pixel by pixel… this trackball..." Read more

    "...They are comfortable to use and the buttons are programmable. This particular model is somewhat dated but it is the most improved...." Read more

    "Trackball works fine, but the software for customization doesn't work on ARM processors like Snapdragon..." Read more

    458 customers mention "Comfort"332 positive126 negative

    Customers find the trackball mouse comfortable to use, noting it's easier on their wrist and pain-free, with one customer mentioning that the buttons are in comfortable positions.

    "Smooth rolling, comfortable and it has the scrolling ring which I didn't realize how much I used until I had a cheaper trackball that didn't have it...." Read more

    "...It gluides silky smooth, has a wrist rest which is very comfortable, and has a page scroll ring around the track ball for easy verticle page moves...." Read more

    "...you find some resistance or friction it is not a big deal but is uncomfortable and a bit annoying since you don't know when you will get that..." Read more

    "Much more comfortable to use than a small mouse or trackball. May help prevent repetitive stress injuries, since my hand is not crunched up." Read more

    442 customers mention "Trackball quality"406 positive36 negative

    Customers praise the trackball's performance, noting that the ball tracks well and consider it the best on the market.

    "...If you are using any other version of Windows this is a great trackball and I love the performance and utility of the Kensington Expert Trackball." Read more

    "...This was the best trackball I've ever tried (going back to 1985) and I love it. But I won't pay $10 a month in perpetuity for a computer peripheral...." Read more

    "Excellent Trackball, it meets everything that I wanted. Very easy to set up, just plugged in and made the adjustments to meet my needs...." Read more

    "The Expert Mouse is a good trackball, however the ball is a bit smaller than the TurboMouse and the angle with or without the wrist rest is not..." Read more

    919 customers mention "Functionality"598 positive321 negative

    Customers have mixed experiences with the trackball mouse's functionality, with some reporting it works well and performs great, while others mention it stops working completely or have issues with the scroll wheel.

    "It works great except for the fact that it is missing 6 buttons that my old track ball had, but they do not make that one anymore, and the old model..." Read more

    "...was using the included dongle for wireless operation. Then just stopped working. got an error from windows stating not a recognized device...." Read more

    "...It works well but not perfectly: The pointer occasionally freezes, but easily resets with a touch to the laptop's glidepath. For this 1-star is lost...." Read more

    "...It still has hitches and just feels rough as you spin it. It works fine, it just doesn't feel like I expect from a peripheral of this price level...." Read more

    526 customers mention "Scroll wheel"276 positive250 negative

    Customers have mixed opinions about the mouse's scroll wheel, with some loving it while others find it terrible and jerky.

    "...I also LOVE the scroll wheel - it's very natural, as I use my index finger for the trackball, my little finger and thumb for the buttons, and my..." Read more

    "...This is a great product. One tiny complaint is that the scroll ring (which is INCREDIBLE) makes a little noise, it can probably be solved using a..." Read more

    "...The software stinks. I use it without the software. I love the scroll ring and that it has a right mouse button...." Read more

    "...The large ball is great for control. The only gripe is the scroll wheel: cheap-feeling, and gritty, not smooth action. Also it is somewhat erratic...." Read more

    499 customers mention "Motion"238 positive261 negative

    Customers have mixed experiences with the trackball's motion: while some praise its smooth and high-precision operation, others report that it barely moves and requires more effort to operate.

    "...Bluetooth is a joke. Jumpy, unresponsive, buggy. love it when it works fine, but most of the time its a complete headache...." Read more

    "...The ball rolls smoothly and only needs cleaning once every other month or so when a carpet of lint covers each glider preventing the ball from free..." Read more

    "...However, the moment that you stopped moving the pointer when you would go back to the trackball about 1/2 the time you would have to slide the ball..." Read more

    "...The ball moves very smoothly and precisely, however, the other reviews that knock this trackball for the smoothness of its scrollwheel are spot-on..." Read more

    376 customers mention "Size"204 positive172 negative

    Customers have mixed opinions about the mouse's size, with some appreciating its large trackball while others find it too big for their hands.

    "...Ball is nice and big and easy to spin. [EDIT: Ball is too big for a woman's hand, after a day, hand and arm get fatigued.] Like the wheel concept...." Read more

    "Returned it. Had too many problem connecting it. Besides, it is too big and feels very uncomfortable, unlike the corded trackball I have been using..." Read more

    "...I like the large ball, and think the trackball is a better solution for my desk setup now. But I will look for alternatives the next time I buy one." Read more

    "...this thing is HUGE. It’s great, but if you’re used a Kensington Orbit, this thing is gonna feel huge. 3.)..." Read more

    So Good, I Bought Two!
    5 out of 5 stars
    So Good, I Bought Two!
    I recently had a keyboard tray installed in my desk at work. This tray doesn't have much room for a standard mouse to move around in, so I decided to look into a trackball mouse and settled on this one. I'm glad I did; not only does it fit in the space, but being able to program the buttons to my liking is a huge help. I enjoyed having a dedicated double-click button so much that I missed it when I was using my computer at home, so I decided to get a second one for home use. I have owned these mice for about two weeks now and can say that I am still happy with my purchases. The trackball, buttons and scroll ring all work well and required only a minimal adjustment period to get used to, and there are so many possible customization options with the software that I was able to set things up in a way that works perfectly for me. The size of the mouse is on the larger size for a mouse but still fits in most spaces comfortably and doesn't slide around when I'm operating it. While I do notice that the scroll ring isn't perfectly smooth when scrolling, it's not a big deal and I still am able to scroll around like a DJ spinning records. About the only drawback I've come across is the fact that the buttons require software to operate, so there are some situations in which custom keys won't work, like installer windows when installing applications (I can only use left click on those) and certain games with anti-cheat features like VRChat (I can't click at all there). This is not to say the mouse will not work for games - I have played Slay The Spire with it just fine, so your milage may vary for games. All in all, I think this is a great mouse and highly recommend it if you are in the market for a trackball mouse.
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    Top reviews from the United States

    • Reviewed in the United States on February 14, 2019
      Style: WirelessPattern Name: MouseVerified Purchase
      First of all, I want to note that I bought this on sale for around $58. At that price, you cannot possibly do better than this trackball, and I own and use a LOT of trackballs. At its normal $99 price, I think you can get better value elsewhere unless you absolutely need a left handed or ambidextrous trackball.

      I am right handed, and use this on my left side to give my right hand a break and for when I'm just leaning back and scrolling through web pages or documents. For certain programs (editing in particular), I will swap this to my primary hand. Being ambidextrous was vital to me.

      Yes, the scroll ring on this trackball has a weird feeling. The other reviews are not lying to you. The ring has a little side to side give to it but I don't have a gritty feeling like others seem to have, rather a plastic on plastic rubbing sensation. It doesn't bother me in the slightest, but it might bother you.

      I don't agree with people saying the trackball is too high or the angle is weird. With the included palm/wrist rest, I find it to be perfect. If you are trying to manipulate this trackball with the tips of your fingers, you are going to be at a weird angle, but you're also not using the trackball correctly and will never be able to reach the buttons. If you're right handed, the base of your hand/palm should to be centered on the included rest, with your pointer finger resting on the top left button, your ring finger resting on the top right button and using those two fingers, in conjunction with your middle finger to manipulate the trackball.

      That brings us to the software and buttons themselves. The Kensington software is fantastic. It works perfectly on my Mac, whether I am on Bluetooth or USB (ignore the reviews saying the software won't work with Mac when on Bluetooth, that is no longer correct). You can adjust the buttons at both the global level and at the individual program level.

      All in all, you cannot possibly do better for the price at $58. For reference, I have an Elecom Huge, which I purchased heavily discounted, a Logitech MX Ergo (Plus version), Logitech M570 and a Logitech Performance MX optical mouse. The Logitech MX Ergo Plus is my primary right handed mouse with this Kensington on my left side, getting almost equal and often simultaneous use. Occasionally I'll go to the Elecom Huge on my right hand to get my thumb a break. The Logitech M570, which the Ergo Plus replaced, is my travel trackball as well as the trackball I'll use on the couch or in bed if I'm on the computer.

      If you're into trackballs and you can get this trackball at or around $60, it should be a no hesitation purchase.
      4 people found this helpful
      Report
    • Reviewed in the United States on August 4, 2024
      Style: WiredPattern Name: MouseVerified Purchase
      I bought this to replace an older one of the same model, that has always (from new) had a crappy scroll ring. I tried everything, lube, taking it apart and cleaning, etc. It just never was smooth and accurate. Something I have read in other reviews of the same product. Not smooth scrolling, rough feeling, inaccurate scroll. etc.

      I figured I'd take a chance, since some of the reviews seemed not to mention any of this. I got it, set it up and it's EXCELLENT! No more rough scroll, inaccurate scroll, or any issues at all....so far. I haver read of connection problems, even wired, but so far, no problems on a 2021 iMac, with Apple M1 silicon.

      I have read complaints on the Kensington Works software, especially from some Mac users. I got away from that entirely a while back, using the (paid version) of "Steermouse" . It takes a bit of a learning curve, but you can set nearly anything you want, and it just WORKS.

      I hope this review helps any other long time Expert Trackball users, although I may have just gotten lucky??! This device does have a rocky track record of reliability and correct operation, so your mileage may vary. But I will say, once set up and working properly, it is a very nice pointing device, if you are into trackballs. I also have a CST L-trak, but keep coming back to the Kensington. It's that scroll wheel...when it works right!
      6 people found this helpful
      Report
    • Reviewed in the United States on October 29, 2025
      Style: WiredPattern Name: MouseVerified Purchase
      Can't go wrong with this trackball mouse. Works great and the programmable buttons are fantastic.
    • Reviewed in the United States on September 22, 2011
      Style: WiredPattern Name: MouseVerified Purchase
      I bought a new Mac last May, and with it I got the Magic Mouse. I was willing to give the Magic Mouse a good try, but decided after approximately three months that I needed to go back to a track ball. This was after downloading several Magic Mouse programs, all of which were supposed to make the Mouse easier to use, had more gestures, etc. I tried them all, but still had issues with the Magic Mouse.

      I have limited space on my desk top to use any mouse, wireless or not. And a track ball serves my needs a lot better. Also the battery life on Apple's Magic Mouse required changing the batteries about once a month. I found this to be tedious--another reason to upgrade to the track ball.

      I had a Kensington track ball on my G4 computer, but the old track ball wasn't compatible with my new iMac. The new track ball doesn't have the four buttons on the top of the track ball, and I would like them back. The previous model had an easy-to-use scroll wheel on the top of the ball. The new model doesn't. Instead Kensington decided to place a plastic wheel around the trackball which scrolls the page that your on. I find this wheel better than the old one, but I also find it to be "flimsy" and not the quality of the rest of the track ball. Not being an plastics or mechanical engineer, I have no recommendation as far as an improvement is concerned. But I do think that Kensington can made an improvement in this ring. Possible a ring made out of Teflon would work.

      The tactile feeling of all four buttons is excellent as is the software. I have all four buttons programmed both individually and collectively (top two/bottom two buttons). I had a wrist pad on the old track ball, and am using the wrist pad on the new one too. It serves to position my hand/wrist in the proper place to handle the various moves of the track ball.

      The interface to the Mac was simple and easy to implement. I plugged in the track ball to the Mac's keyboard, installed the software, and that was it. Up and running in no time. And most important, I have taken the batteries out of the Magic Mouse and stored the MM on the bookshelf.

      Since I have not had the need to clean the track ball, I have not rated "cleaning" as part of the evaluation. And therefore I can't comment on the ease of cleaning the track ball.

      I did look at other track ball options, but decided that since Kensington was the product line that I was familiar with, that I would go with them again. I don't regret that decision at all. Good product for the money.

      PS-Today I spilled my morning OJ right into the trackball. I figured that the ball was no longer under either Amazon's warranty nor Kensington's. So I proceeded to take the ball apart to clean the OJ our of the ball. In the process I damaged the wrist pad. So I wrote to Kensington in order to get info on a replacement. Here's their response:
      -----------
      Dear Richard:

      Thank you for contacting Kensington Technical Support.

      We apologize for the inconvenience caused. We regret to inform you that Kensington does not manufacture the wrist rests separately and they are not available for sales or replacement as they are part of the Complete unit.

      In short get lost they are saying, we have logged the sale in and you're history. And here is my response:

      I know that you guys think that I enjoy trading correspondence with you. But the fact is that I am not having fun doing so. SO SINCE KENSINGTON DOESN'T MANUFACTURE THE WRIST PAD FOR THE EXPERT TRACKBALL, WHERE THE HELL CAN I OBTAIN ONE AS A REPLACEMENT??? If this is what you consider Customer Service, rest assured that I don't.
      --------

      It seems that Kensington's apology is to say the least feeble. If a company can't or in this case won't support their products after the sale, then what good is it?

      Some might say, "Not having a wrist pad is no big deal". And everyone is entitled to their opinions. But I agree with Kensington: " as they are part of the Complete unit" and should be supported by Kensington without the customer having to purchase another trackball.

      I've been happy with Kensington trackballs for many years. But I won't plunk down my hard earned $$$ for anything else that says "Kensington" on it.
      4 people found this helpful
      Report

    Top reviews from other countries

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    • Uncle grumpy
      5.0 out of 5 stars Came for the ergonomics, stayed for the productivity
      Reviewed in the United Kingdom on March 5, 2021
      Style: WirelessPattern Name: MouseVerified Purchase
      Why, why did I wait to buy one of these it's beyond brilliant.

      First up let me explain, about 3 months before buying this I had a fall and broke my wrist, broke 2 bones and did some ligament damage - ouch, yes it's as painful as it sounds and if you take nothing else away from this review be careful with icy pavements.

      The healing from a broken wrist can take up to a year in some cases and a lot of pain ensues while thats happening, when I had a cast on for 6 weeks towards the end there was no discomfort hardly at all so in my head it's yay, cast off, back to normal, rock on. Er no, as the cast came off my reaction was mm ow ow OW OW! MOTHERFU.... that hurts, and so began a quest to find someting I could use comfortably and get my extremely bored arse back to work.

      So finally, the trackball itself, what can I say, silky smooth operation from the actual ball, being 55mm across it means you can control it with three fingers if needs be, the four buttons around the ball are totally customisable if you download a small application from Kensingtons website and you aren't limited to four functions either, you can add keys to each button so you get a different function if you press shift, or control, or alt or the win key so four individual functions on each of four buttons - that's a lot of shortcuts. In addition to this you can specify a set of shortcuts for each application, the combinations and permutations are mind boggling. There is also a scroll wheel right next to the ball and again it's customisable in terms of speed and direction and inertia which I tried but didn't like but it's worth looking at it to see if it works for you.

      There is of course the usual pointer speed control which using a super ultra wide high resolution monitor I have set quite high to quickly move around the huge screen area, that is fine but it's not the most precise method - however Kensington have thought of that too, you can set one of three keys to instantly and temporarily lower the pointer speed making precision a doddle, there is even a setting to lock the movement to just vertical or horizontal movement in a single axis and while this might not sound like the pinnacle of technology if say you have a bunch of tabs open in a browser or are going through a bunch of drop down menus in a professional application such as Photoshop or illustrator - which I do all day every day while doing actual work it just makes it even easier - hence quicker to use. It's just one more reason to like this trackball and why I will NEVER go back to using a mouse again - ever.

      Looking at one of the other reviews there was a criticism that you had to float your arm to use the trackball and it placed strain on your arm/wrist - well as this was the entire reason I'd been looking at things like this trackball to reduce just that and allow me to get back to work take a look at this...

      https://www.amazon.co.uk/gp/product/B0752MCX82/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

      It's basically a device that clamps to your desk and cradles your arm taking the weight and strain away from your arm - and crucially for me the wrist, a combination of that cradle and this trackball means I have a perfectly straight arm position from the elbow to fingertips and the sometimes unbearable pain of using a mouse - and i've tried 6, everything from gaming mice to really thin bluetooth mice to smaller sized mice, even a vertical mouse has gone, I can use this for hours with nothing more than the odd twinge - using a mouse all day I'd have to mainline so many painkillers it'd turn me into a zombie.

      Very seldom do I buy anything that makes a real improvement to my daily life but this is definitely one of those times and I don't like this trackball I love it.
    • apgimenez
      5.0 out of 5 stars Perfecto para trabajos de precisión
      Reviewed in Spain on January 3, 2024
      Style: WirelessPattern Name: MouseVerified Purchase
      Desde que lo uso ya no se me cansa la muñeca, a pesar de que lo utilizo unas seis horas al día. He ganado en productividad porque, gracias a su gran bola, puedo situar el cursor exactamente donde quiero a gran velocidad. Los cuatro pulsadores de que dispone son grandes, sensibles y cómodos para usar. Aunque puede configurarse para que la pulsación conjunta de dos botones adyacentes sea equivalente a otro botón, esto no me resulta práctico porque es difícil hacer la pulsación simultánea.
      Report
    • Reg Armstrong
      5.0 out of 5 stars Love this trackball.
      Reviewed in Australia on September 4, 2025
      Style: WiredPattern Name: MouseVerified Purchase
      Fantastic unit, wish I had got this sooner.
    • DuneTiger
      5.0 out of 5 stars A few flaws, but I'm a trackball convert anyway!
      Reviewed in Canada on November 6, 2020
      Style: WirelessPattern Name: MouseVerified Purchase
      A trackball is nothing I would have considered in the past as most of my PC time is used for gaming and being able to do work has always just been a "bonus" of the platform. However, over the course of the wonderful year of 2020, I had to find solutions to working from home and purchased not just one, but two trackballs. I first started with Logitech's M570 (wireless) and followed it up a couple of months later with the Kensington Expert Wireless. Chances are that if you're seriously considering transitioning to a trackball, you are looking at exactly these two models or their wired siblings.

      Both solved a very simple problem of making the most of confined space. For my gaming and personal PC, I have a typical desk setup with a brick of a gaming mouse, but for the work laptop I lugged home with me, the idea was that it was a temporary thing and I'd be back in the office with a full desk in no time. Three quarters of a year later and the work machine is growing roots in an old TV table. I managed for a very long time as I was quite comfortable with simply using the built-in trackpad, but when they replaced my machine with a new one, I could no longer work without wanting to throw it out the window. The 'brilliant' minds that designed the new trackpad clearly never used one as they removed the physical buttons that bisected the pad and made the pad itself one giant button that would only right click if you used the very bottom right corner. So now I needed a mouse, but TV trays don't have the runway for effective mouse use. Enter the trackball. Since trackballs stay put, they can sit comfortably in a small space and you still have full use of your cursor.

      The second thing both trackballs solved was the right-click issue. While the M570 has more traditional placement of buttons like a regular mouse, the Kensington Expert (herein "Expert") has four fairly large buttons that can be tapped easily regardless of what hand position you take. Since the laptop's trackpad cut the right-click distance by 2/3rds and I live and die by context menus, I needed that functionality without feeling the need to break equipment.

      The above issues are solved by pretty much any trackball device available in the market today, so what it really comes down to aside from general reliability and longevity is preference. First off, while the M570 seems sturdy enough, the Expert feels like a tank. It has a fairly large footprint compared to the relatively mouse-sized M570, but the Expert also has a much larger ball (maybe three times bigger?) and is heavier and kept in place with rubber feet. As mentioned above, it has four large programmable buttons surrounding the trackball and a rubbery ridged wheel that provides you with your scrolling (compared to Kensington's Slimblade which has you twisting the ball in the socket to scroll instead). The Expert uses the bottom left button (by default) for left click and the bottom right for right click. Since the ball is finger operated as opposed to thumb-operated M570, you typically use your thumb and pinky to click and right-click respectively. It takes some getting used to, but it really becomes second nature pretty quickly. On top of that, you get two extra programmable button assignments by clicking the top two or the bottom two buttons together.

      Despite its wider footprint, the Expert has become my go-to device for work while the M570 has been repurposed for the media machine I have connected to my TV. While it comes with a very sturdy wrist pad to help with your ergonomics, since I sit higher than the Expert instead of level with it, I find it feels better without the pad attached. The larger ball is much easier to manipulate and makes more logistical sense than when using the thumb ball of the M570 and Kensington's software allows you to set up keyboard hotkeys to assist with accuracy. For example, I can hold the Ctrl key to drastically slow down the cursor (this is completely customizable) so I can select specific things or position the cursor with precision.

      For cleaning, the ball is held in the device by gravity only and can be easily lifted out without having to lift the base unit (and it's kinda fun to do that anyway). Underneath you'll have access to the sensor as well as the three beads or skates that the ball rides on. I don't find that the ball is a dust magnet, but normal use will see crud accumulate either on it or on the skates. It's easy to simply lift the ball and give everything a wipe down.

      There's only two things that I am nitpicky about when it comes to the Expert. First, the ball has a very high profile (exactly half of it is exposed) and while I find it very comfortable to use throughout the day and experience no wrist strain whatsoever, it would have been nice if the 'horizon' or the plane of the base unit was a bit higher and the ball sunk a bit lower (things addressed in the Slimblade). The second thing is that this thing puts itself to sleep, which is admittedly a good thing. However, you cannot wake it by rolling the ball or scrolling the wheel; you must click one of the buttons to wake the device from sleep, but the click is actually registered with the OS and is not thrown away. Therefore, unless you're expressly positioning your cursor safely when you go idle, then you need to be careful on what button you press to wake your device. Neither are dealbreakers, but I really find the registration of the wake input to be weird.

      Overall, I am very happy with both of my purchases, but the Expert won out as my day-to-day solution for work. I would never use the device for gaming (at least competitively), but its customizable configuration from speed to keystrokes with Kensington's lightweight software easily make it a power-user's device. It may be unintuitive at first, and I was always first in line to mock these devices, but I have completely turned around on them. I think wherever I go in my professional life, the Expert will come with me.
    • Mark von Reddy
      5.0 out of 5 stars Your Best Studio Buddy!
      Reviewed in India on April 21, 2015
      Style: WiredPattern Name: MouseVerified Purchase
      This product has found its home in almost every professional recording studio in the world. It is extremely dextrous and such a comfort to the wrist. Long hours at the studio don't seem so long anymore! The only issue I have noticed is with the scroll wheel not performing smoothly, but it still works. The trackball is weighted and has sufficient momentum to sen e cursor flying to the other end of the wide screen display. Integrates very well with Pro Tools, and general workflow. I am yet to try out the customisable top keys to instantiate macros. Very satisfied with the product finish and quality.