Lexar Device Will Not Read 32GB CF Cards
352404
This USB 3.0 device cannot access my 32GB CF cards. I have two SanDisk Extreme Pro 32GB and two SanDisk Extreme 60MB/s 32 GB cards. I've tried to read all four 32GB cards with the Lexar reader and none of them are discoverable on my new PC running Windows 7 Ultimate.

To test the device, I rebooted three times. Once with the reader disconnected and then reconnected after boot, once with the reader connected during the boot, and once with the reader connected and a card inserted. Under none of these conditions does the Lexar device offer me access to any of my 32GB cards. All of the cards were formatted "in camera" via my Nikon D3 (as is recommended for CF cards). The 32GB cards don't show up as a drive in My Computer nor are they recognized in Lightroom 3.

HOWEVER, the reader works perfectly with my SanDisk Extreme III 16GB cards. Apparently the problem only lies with larger cards. I haven't tested the device with cards smaller than 16GB.

After my purchase and via subsequent research here on Amazon, this same problem was reported by other reviewers in regards to the USB 2.0 version of the device.

Although the device worked with my 16GB cards, you might want to hold off on your purchase of this reader as apparently Lexar has some kind if hardware or software issue that is continuing through several iterations of their product (based on the reviews I've read here about the USB 2.0 device).

UPDATE: I've received a replacement reader and the new device appears to be working correctly. I'm able to read all of my 32GB cards with the new device. I'm upgrading my rating from 1 star to 3 stars for now. I'll upgrade it to 4 stars if the new device operates flawlessly through several events.

ANOTHER UPDATE: I received a call from a senior Lexar engineer a few days after my support call and he wanted to follow up on getting the problem fixed. I told him that I'd let him know if the problem remained after getting the replacement. I've missed his call 3 times now and he keeps calling me every day. I'm pretty impressed with that follow up so I'm upping the stars to 4.
2085722
I had the opportunity to compare the performance of the fastest microsd cards currently available from top manufacturers.  All cards mentioned in this review are obtained from Amazon during the last week or two except when noted otherwise.

Test Setup:
Lexar Professional workflow UR1 microsd card reader was used for all tests except when noted
CrystalDiskMark 5.0.2 x64 was used to produce all the test results and was set up with 2 passes and 100MB read/write size
All cards up to 32GB are formatted as FAT32 with 32KB allocation unit size, all 64GB cards are formatted exFAT with 128KB allocation unit size

Test Results (Numbers are Sequential Read, Sequential Write, 4K Random Read, 4K Random Write in MB/s, speeds greater than 10MB/s were rounded to the whole numbers)

16 GB Alphabetically
Lexar 633x**  -- 88, 25, 8.7, 1.2
Panasonic U3**  -- 93, 42, 11, 0.7
Sandisk Extreme Pro  -- 95, 80, 7.6, 2.6 <== the listed product

32 GB Alphabetically
Delkin U3  -- 93, 59, 11, 0.6
Kingston 90R/80W  -- 93, 58, 11, 0.6
Lexar 1000x  -- 90, 57, 10, 1.4
Lexar 1000x with Bundled Reader*  -- 148, 60, 10, 1.4
Patriot EP  -- 90, 35, 10, 0.6
PNY Turbo Performance  -- 91, 55, 6.9, 0.9
Samsung Pro gray  -- 92, 82, 10, 3.6
Sandisk Extreme Pro  -- 94, 87, 9, 3.0 <== the listed product
Sony up to 95MB/s  -- 91, 51, 4.8, 0.9
Transcend Ultimate 633x  -- 93, 85, 8.1, 1.4

64 GB Alphabetically
Delkin U3  -- 94, 27, 13, 0.3
Kingston 90R/80W  -- 94, 25, 13, 0.3
Lexar 1000x  -- 92, 56, 12, 1.5
Lexar 1000x with Bundled Reader*  -- 153, 66, 11, 1.7
Patriot EP  -- 81, 22, 11, 0.6
PNY Turbo Performance  -- 92, 54, 6.9, 0.9
Samsung black  -- 82, 20, 8.8, 2.1
Samsung Pro gray  -- 90, 80, 10, 3.5
Samsung Pro+ ***  -- 92, 86, 10, 5.3
Sandisk Extreme Plus****  -- 92, 58, 10, 2.8
Sandisk Extreme Pro - 97, 91, 10, 3.0 <== the listed product
Sandisk Ultra *****  -- 46, 16, 7.0, 2.1
Sony up to 95MB/s  -- 92, 49, 5.2, 0.9
Transcend Ultimate 633x  -- 93, 83, 7.3, 1.4

128 GB Alphabetically
Lexar 633x -- 78, 28, 3.3, 1.4
Sandisk Ultra -- 92, 19, 6.4, 2.4

* The Lexar 1000x card is the only UHS-II card available and tested, the bundled USB reader has extra pins for reading UHS-II card
** Came bundled with a device
*** Purchased from a large west coast electronics retailer.  This card is a new release and not currently available on Amazon.  It is different from the gray-colored Pro card
**** old model tested, not the current U3 model
***** old model tested

Fastest Sequential Read:
All tested cards were able to accomplish > 90MB/s, with the Lexar 1000x able to take advantage of UHS-II speed when using the bundled USB reader and leading the pack

Fastest Sequential Write:
Sandisk Extreme Pro, Samsung Pro+, Transcend Ultimate 633x

Fastest Random Read:
Kingston 90R/80W.

Fastest Random Write:
Samsung Pro+

Best overall:
Samsung Pro+ and Sandisk Extreme Pro

Other observations:
Performance and price are not proportional when it comes to selecting a microSD card.  Some of the worst performing cards in this review also happen to be the most expensive.
Not all 633x cards are created equal.  The two cards reviewed from Lexar and Transcend are both marked as 633x but vary in performance greatly.
4k video recording using action cams and drone cameras have a typical bitrate of 60mbps or 100mbps, corresponding to 7.5MB/s to 12.5MB/s.  All cards in this review should theoretically be able to handle this usage easily.
Using microsd card as supplemental phone storage potentially could benefit from a faster card,

Best Looking Card (if it matters):
Sandisk Extreme Pro: Red/Gold with white print
Lexar 1000x: White/Gold with Black/White print
Samsung Pro+: White/Black with a red stripe and Black/White print
PNY Turbo: Lime Green/Black with Black/White print

Update 9/14/2015: Added additional cards to the list.
4790271
Is not readable in about 50% of devices I try to put this in,  even in the same computer some of my USB ports can read it others can not, but other USB devices i have work fine in all of my ports so its not a defective port, I can not recommend this item.

**UPDATE, i sent my drive in for an RMA through Lexar and had a brand new replacement within a week, and so far replacement works great!  I guess i got a lemon first time around.
2926506
just purchase a  SDHC/SB 6 Generation CF adapter to use my 8bg+Wi-Fi Pro X2 Eye-Fi Card on my Canon 7d. When I turn on Canon message on my display says " Card cannot be accessed. Reinsert/change the card or format card with camera". Is there something I need to do or did I receive a defected card?
1905929
Card not capable to handle 32gb SD.  There is noting mentioned in the spec that there is any limit.  The card will work with 8gb SD.
2243259
I use a windows 7 64 bit OS. And I think that's where the hitch is at. I tried each of my USB ports, but it would not read the 8gb card I had in it. I went to their website in hopes of finding something, but discovered much of nothing of help. However, the price was extremely cheap so I'm not too bothered.
1551936
I got one last year and it quitted in a few month. After replacing with Lexar, it stopped working again in a month!!
It is totally NOT reliable and I lost all my data!!
I do not think this is a good choice.
4856428
Only good for my SD cards.  CF cards do not fit, to tight.  Very disappointed in this card reader.
2201791
I don't normally write reviews, but I feel that it's necessary to let people know.  This player only works with Micro SDHC cards up to 16 gb.  I was lead to believe that this player would work with the 32gb card.

The player was cool, but the reviews and description were a little bit misleading.  Would buy again, but BUY BEWARE!
2858287
It reads eight memory card sizes. However, in order to read the ninth format, the Mini SD, it requires an adapter which is not included. Purchased two. One for home and one for my travel kit. Provides the speed of USB 3 while still compatible with USB 2. No drivers to install and supports hot swapping. Could not evaluate reliability since I only had them for about a week.
2019418
I purchased the Lexar CF reader in January 2014. Absolutely love it. Going from a USB 2.0 to 3.0 was a considerable bump in speed. Somewhere in 2016, I noticed it intermittently stopped working. I had to remove the card and unplug both ends of the cable. Since then the issue became more common and required multiple cable disconnects to get it to work. Having said that, I've ordered another one as a replacement. I only wish Lexar had made a Thunderbolt for the CF card. It's good to see they made a TB 2 compatible card reader for the CF Fast cards.
3552928
Product seems to work OK, but for whatever reason the transfer speed slows down dramatically once the card gets more than halfway full. I don't have this problem with my SanDisk cards or lower capacity Lexars
2866898
Have a MacBook OSX 10.7.4.  Using SanDisk SDHC 8GB Memory Cards.  Some cards do not read.  I.e., plug it in and nothing shows up on my desktop.  Visited Kingston website and discovered a firmware update was available.  But not for Macs...  Now it is a matter of discovering which company is at fault:  Kingston or SanDisk.
698784
I have both the 32GB and 16GB models - 37MB/s Write and 124MB/s read  while my Lexar USB 3 thumb drive gets 145MB/s write and 350MB/s read
1519893
The drive is very fast, and seems to be a better value than CF cards from SanDisk and Lexar.  In my testing, it reached around 130MB/S read and 100MB/S write, which I consider very close to the specifications.  I highly recommend it, it works flawlessly with my card reader and Canon 5D Mark II.
1233075
BEWARE - this reader does not want to recognize 16GB Kingston cards. No problem with smaller CF cards, but I need support for the 16GB and above. So this reader is going back to the store tomorrow. Also there are no status/activity leds.
2787306
When I first put the card in the camera it would see the card and said the card was full. Then I would get "INT" where the card symbol was. I looked through the camera menu to find where I can format the card. It couldn't find a card to format. I put the card in the computer with the PC adapter. The PC will see the adapter but would not recognize the card. I finally opened the Disk Management  utility on the PC with the card in the adapter and the computer finally saw it. I initialized the card and formatted it to the correct FAT32 and the card sizes shows as the correct 29.12 GB. The camera sees the card now.

The card holder on the camera is intermittent also. It takes a few tries to get the card to seat correctly.

After all this the camera seems to be recording video and audio correctly and saving to the card for playback on the computer. I haven't had a chance to play with the night mode yet. If that works correctly I will keep the camera and cancel the return.