The Tuff 'n Tiny looks interesting. But I would be concerned about static discharge across the exposed contacts when carried in a pocket.

I have some ancient Lexar USB drives, a 4 year-old PNY Attache drive, and several unknown drives received from vendors that also work flawlessly. In fact, now that I think about it, the only problem I've had with USB drives is losing them, or the drive not fitting into a recessed USB jack.

My current favorite is the Kingston DataTraveler Locker with included encryption. I've plugged these into all kinds of computers with different versions of Windows, old USB 1.0 through the new USB 3 draft, and the drives and encryption software works flawlessly.