Pros: Never seen a failure, I have many of them. I primarily store hard-drive images on them using Symantec Ghost (the expensive corporate product, not the cheap Norton Ghost).

Cons: No cons that I can see so far. I can attach a little metal ring if I really care about hooking it to a key chain (like everyone bellyaches about)...what a bunch of whiners...waa waa. However, I've never dealt with SanDisk customer service like one person complained about, which could be a legitimate complaint.

Overall Review: Can't wait for larger capacity. There was a Japanese company that had a 64 GB solid-state USB thumb-stick back about 2005, but it cost US$5000 (yes, 5 grand). Imagine what capacity is possible now (2011) in a solid-state USB thumb-stick if money is no object.

Pros: Nice physical design with external power port for high-draw devices.

Cons: BAD MANUFACTURING....crashed 2 Windows XP laptops AND 2 Windows 7 laptops (all 4 laptops are very well maintained machines). All 4 machines gave the blue screen (critical failure warning message).

Overall Review: Rather pay more for true "government-grade" electronics than cheap consumer junk.