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on December 7, 2013
This is a good dual card reader. I have a version that only reads CF cards from Lexar for firewire 800. That's actually a better built device, but you don't always have access to firewire, and can't read SD cards. This card reader works well, but the "pop-up" feature of the reader seems a little bit cheesy and doesn't always pop up easily, but otherwise had been working good so far. The pop-up feature does however allow you to transport it more compactly in your laptop case, etc.
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on May 31, 2012
Hello fellow Amazonians. I received this item and am very pleased with the build quality, size and look. The box has a label placed over the original printed box label with the current model number LRW307URBNA, but the reader has a label on it, which has the part number LRW300U which is old and I confirmed that with the mfg. Please contact Amazon if you have the same issue if you care. This is a careless mistake on Amazon's part or the mfg., but the mfg. claims Amazon must have miss packaged it somehow. I will readjust as necessary. Amazon did a refund because item is no longer available through them. Figures. I will probably purchase somewhere else like BHphoto&video for a better chance of the actual model.

Update_2012-07-14: I purchased one from B&H Photo & Video. Same thing happened. Box says UDMA 7 support (sticker) and barcode on bottom says LRW307URBNA. Inside, the unit has a model # of LRW300U. I was very curious how this happened again, so I called Lexar tech support instead of email. Well I immediately was on the line with someone who knew what they were talking about. The unit needs a firmware update. The only change from the LRW300 to LRW307 is firmware, so even if you have a LRW300, you can update it. I now raise my rating. Thanks

Update 2013-11-22: Please disregard previous reviews. It was the manufacturers fault to not update their packaging and just place stickers on the box, but everything is fine. Love the reader.
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on July 28, 2013
Worked fast and fine the first month, then started randomly corrupting files, completely useless now. I tried downloading updated firmware, tried plugging and unplugging everything. I tried with both a PC and a Mac with similar results. This is very frustrating. As noted by a previous review, I ordered the LRW307URBNA and received instead LRW300U Rev. D, not what i ordered.
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on May 22, 2012
This reader is blazingly fast, as it should be. And the dual compact flash and SD card slots are nice, which apparently you can read from concurrently. And the design is clever. But the manufacturing is quite poor. The buttons on the side to pop open the reader respond to the most featherlight touch. This thing is not going to stay closed if you put it in your bag. Also, the micro-b USB connector has a very bad connection. If you move the reader just slightly, it will lose the connection. Also, the micro-b connector is very flimsy. I'm guessing it's just a matter of time before it will break and not work at all. For the price, I expected better, and if I were to purchase again I would look for some other USB 3.0 reader.
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on October 23, 2013
I'm not product basher, but I get angry when a critical piece of equipment fails TWICE. I purchased the Lexar Dual Slot USB 3 LRW307URBNA in January 2013 and it stopped working completely in July. I didn't have time to squabble so I purchased another on July 29, 2013. Today the second device stopped working (1 of the 2 slots). I do not recommend this product.
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on December 19, 2012
I benchmarked this Lexar reader (firmware LX07 which is the latest as of this review) with my 16GB Sandisk Extreme Pro CF card (advertised as a 90MB/sec AKA 600x card) and got disappointing read performance from this specific card when compared to 2 other cheaper USB 3.0 readers. I'm most interested in the read speeds off my CF cards as that's my primary use case (offloading images from my cards to my computer).

The same 16GB Sandisk Extreme Pro CF card in the Transcend USB 3.0 Super Speed Multi-Card Reader for SD/SDHC/SDXC/MS/CF Cards (TS-RDF8) and Kingston's USB 3.0 Media Reader Computer Memory FCR-HS3 benchmarked sustained reads at over 95MB/sec with Crystal Disk Mark 3.0.2 x64, whereas this Lexar reader only benchmarked @ 56 MB/sec.

I also performed benchmarks using HD Tune 2.55 and ATTO Disk Benchmark and the results were consistent -- the Kinston and Transcend readers had sustained read transfer rates in the 90-95 MB/sec range while this Lexar reader was about 40 MB/sec slower. I repeated these tests twice just to make sure they weren't flukes and got consistent results.

I did the benchmarks connected to the same USB 3.0 port and used the same USB 3.0 cable for all the readers. Computer is Windows 7 Professional 64-bit, Intel Core i5 2500K, 8GB RAM, 256GB Samsung 830 SSD boot drive.

I also tested my older 4GB Sandisk Extreme IV card and a 4GB Sandisk Ultra II card and all 3 readers got similar read speeds (~40MB/sec and ~12MB/sec, respectively), so it appears with slower rated CF cards the Lexar didn't have any issues, but with the Sandisk Extreme Pro it wasn't reading as fast as it could, as evidenced by the benchmarks with the other two readers.

I'm not sure how Lexar CF cards would perform in this reader as I only have Sandisk CF cards, but looks like I'm going to return this reader since it performs the worse with the largest and fastest CF card I use.
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on August 22, 2012
I have a this Lexar Media Dual Slot USB 3.0 Reader. It's fast when it works, but it frequently gets kicked out when i start the transfer to Lightroom or ingest files via FCPX. (Mac Book Pro with USB 3.0 / Mac Pro 1,1 w/ USB 3.0 Card installed)
it used to be erratic, then tech support told me to do a firmware update via [...]
but it was pointless. it still did the same things and got worse overtime, until it just didn't work at all.

also, the USB 3.0 cable comes off from its connector. (shallow connection)

for warranty, RMA process requires you to send your old system before they could send you a replacement from Ohio. (hassle) no other options. (hassle)

although it was blazing fast when it worked, its hay-day was short-lived, I wouldn't recommend this product to anyone.
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on January 8, 2014
I am a software developer that works with USB. I own a lot of USB card readers (jars full of them). A couple of things you should know before you plunk down $30-40 on any reader. First, you won't ever get the full speed (e.g. 500MB/s). This is theoretical and I do not believe it is ethical to advertise. Second, you most likely won't benefit from USB 3.0. Even if your computer supports USB 3.0, you are limited to the card read speed. Most cards max out at 20MB/s. This is well below USB 2.0 threshold of 30/MB/s. Finally, even if you have a card capable of 50MB/s, that is the burst speed. You will only achieve it when transferring large (video) files. That said, I would recommend getting a USB 3.0 reader if it's only a few dollars more.

This reader is heavy and has a detachable cord that sticks out the back. This OK for an office, but makes it clunky to travel with. Also the device closes into itself. I believe this is to protect the contacts, which is a good idea. Unfortunately, I've had issues with the device collapsing on itself when inserting cards.

This reader has performed no better speed wise than any other reader $10 reader I own. Further, this reader does not work with most of my Android devices. Your money is better spent on a $10ish card reader from a major manufacturer. Also, I do not recommend buying the unbranded < $5 ones. I have found these to be more likely to be glitchy.

Most of my experience is with SD cards and photos. There may be a segment of people using CF cards that may benefit from this reader. Currently my "Daily Driver" reader is a Kingston MobileLite G3 SD/microSD reader. It's very compact and it has worked well.
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on June 14, 2012
Like other reviewers, this is a warning to not buy this item from Amazon. There are now four reviews indicating that someone is doing a bait and switch on this item. In my case the Lexar box/packaging clearly stated that it should have been model LRW307URBNA, Revision A. The product inside the box was clearly labeled as an older LRW300U Rev B1 model. Very disappointed as the box looked as though it had been opened in order to substitute an older model. I contacted the manufacturer and they indicated that it must be a problem at Amazon, but they don't seem to realize that sales of this item will plummet if one of the major on-line distributors is substituting outdated product in original packaging.
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on November 21, 2012
I bought this and the lexar 25 in 1 reader. This is 80% more money and supports only 2 card types instead of 25. Plus, the speeds are identical over a brand new macbook pro retina usb 3.0, except that this reader needs a firmware update to get there, while the other one is fine out of the box.

This is the one you want instead:
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