So I waited for the price to drop below $200, before I purchased. I bought a refurbished unit for $175. (I heard you can by them for as low as $100 now.) I must say that I am really impressed with this Lapdock and it far exceeded my expectations. I am running Gingerbread with Firefox 4.0. (It is fast at loading pages.) I don't own any mobile devices like a tablet, laptop, ipad, etc. Just my Atrix.
It meets all of my needs and more. You don't need the 4G tethering plan to use Firefox. You can use wifi and when on the go, just use the browser app, within the mobile view. (I kept my unlimited data plan.) I have had mine for about a month now and still learning how to use it and new tricks. Since there is no users manual, as to all of the features, you will have to discover them by playing around with it, forums like this, trial and error. So here are the pros and cons I have discovered so far.
Pros:
1) Netbook experience, but has limitations.
2) You have complete access of your phone's functions and apps within the mobile view.
3) If you have a word processing app on your phone, you can create/view and edit: PDF, excel, word documents and powerpoint presentations. (Even though there are no spell check for android any of the word processing apps, you can still use the spell check/word suggestion, from the on screen keyboard, while using the qwerty keyboard.) You have to right click on the mouse to get the dialog box and choose multi touch keyboard and then just minimize the on screen keyboard.
4) You can access the internet thru the mobile or webtop view. (Don't need a tethering plan.)
5) You can access all of your videos, pictures and documents in both mobile and webtop view.
6) You can save movies to an SD card or flash drive and play them with in the mobile or webtop view. (There is some choppiness, but its not bad.) The bigger the viewing window, the chopper it is. This works for movies rented from the android market too.
7) You can hook up a USB or cable mouse.
8) The lapdock charges your phone really fast, when docked. (It doesn't matter if the lapdock is plugged into an outlet or not.) You can easily get 2 full charges on your phone if your phone is down to 30% battery, if the lapdock is fully charged.
9) The key board is really nice and spacious. Easy to type on once you get use to it. Has a lot of quick function keys like: Vol., screen brightness, etc.
10) The mouse pad is easy to use, really big, can be turned off and has two function buttons. (Its not multi touch, but you can double tap to scroll.)
11) Its very lightweight, thin and easy to carry around.
12) You can set up your webtop desktop background to whatever you want and can customize the dock bar with mobile apps and web apps/shortcuts.
13) In the Firefox window, you can customize it how you like and can choose your default home page. (I have mine set to Google.)
14) You forget your using your phone to power the lapdock.
15) All of your internet bookmarks show up in Firefox as well as the mobile browser. (I doesn't matter if you created them in either or.)
16) Playing your MP3's or streaming music, sounds pretty good thru the lapdock speakers. (You can use mobile and webtop view.)Listen privately using the head phone jack on the phone.
17) Multitasking is really easy in both the mobile and webtop view.
18) You can answer and make phone calls. Send text and e-mail, etc.
19) You can enlarge mobile and webtop view to take up the whole screen or resize windows as you see fit. (Just like on a windows PC.)
20) File management is really easy and you can view your pictures in list or thumbnail view.
21) You can still access all apps in airplane mode that doesn't require a data connection. (I used my lapdock while on a plane and the experience was really nice.) I had all my music and movies on SD cards to listen to and watch.
22) Most games play just as good as it does when using the phones screen. (Racing games or any that use the accelerometer, require you to tilt the lapdock.)
23) The battery life is 8 hrs on full charge. (Will be less, depending on how low the Atrix Is, video play back and what you are doing.) It definitely will last longer then any laptop, netbook or tablet.
24) Over 6 ft. Charging plug.
25) You have a tab view in both mobile and webtop view. (Much easier and faster to move around apps.)
26) User interface is really nice and surpasses some netbooks and laptops functions. (Scrolling view of all open windows with in webtop.)
27) Only have to carry around your phone and lapdock.
28) Screen is beautiful, bright and sharp.
29) Flash video and playback streams nice with no lag or choppiness.
Cons
1) Dock is useless without the Atrix 4G and only works with the Atrix 4G.
2) It will lag, if you have to many apps or website tabs open at one time.
3) Video play back is a little laggy, when viewing full screen.
(Doesn't matter if it was saved to SD card or streaming.)
4) No way to view powerpoint presentations on a view screen.
5) Can't add apps to webtop desktop.
6) No touch screen.
So, I hope I was able to help you in deciding if this lapdock is for you or not. You wanna know something else, I typed up this review on it and it was cool.