Pros: Ultra small. Great for restricted areas, where you don't want the drive sticking out to catch on things, or it needs to be inconspicuous.
Cons: Lanyard attachment point may be a bit weak for use as a flash drive you might keep on your keychain. Provided lanyard is very difficult to thread through the small hole provided on the flash drive itself. It can be done, but it takes work to get it. Quite slow writing, fair speed reading. You wouldn't want to use it much for transfering mega files unless you weren't in a hurry.
Summary: I took one star away for one simple reason (a reason not exclusive to SanDisk flash drives). Why is it that flash-drive makers automatically format them for FAT32? Ever since Windows 2000, NTFS file systems have ruled the roost. Normally, I format new flash drives anyway to remove unwanted software - since all I want in a flash drive is a storage medium, nothing more. But that's when I discovered it was formated for FAT32.
Summary: Have only had it for a week or so, but so far it works as expected ... and even a little better. Leaving it formatted as exFAT, it has been faster than my SanDisk Cruzer Sync 16GB (and I had tried formatting the 16gb with both FAT and NTFS). I didn't find the SecureAccess or other bundled software helpful (SecureAccess requires you to move/unencrypt files to edit them).
Summary: When purchasing flash drives I try to read the reviews and understand what I'm getting into. Unfortunately, this one had no reviews, but was such a good deal, I decided to purchase it anyway. I have read about fake usb flash devices being sold (mainly on ebay but also on amazon), so I was a bit wary.
Cons: Very slow write speeds. On my old P4B-LX usb 1.1 spec, I'm lucking to get 1mbps of sustained write. (still less that the transfer speeds of my modem when using the usb connection, that averages 1400kbps so I know theres room for improvement.)