I have been using one of these for nearly a year now. It has worked incredibly well for me. I use a number of different computers and I use this Lexar 16GB to keep all my critical files when moving from computer to computer. My Lenovo/Thinkpad has a built in slot for this, so I can just insert it in the side. My desktop computer I use most often has an external USB connected device that allows me to plug in this device and have all my files available to working. (That external device was a bit hard to find but it's been very valuable to have.) Back to the Lexar card. I have had no trouble at all with it. It's worked exactly as I wish it to work. Reliable and allows for transfer of very large files between computers in addition to keeping most of one's usual work files. (I backup all the files on the Lexar to a subdirectory on my desktop, routinely, and that subdirectory is backed up to the internet via Carbonite.)
If you have the need for a device like this, I highly recommend this unit. I am eager to see them come out with a 32 GB version.