Fairly fast for a flash drive in late 2011 but if you're planning to use the drive on a key ring there are some issues.
The key ring loop is very narrow with sharp corners. I had to widen the gap to allow the key ring to move freely, this was fairly easy with a sharp knife. I also found that the corners of the drive were quite sharp so had to round them off with a knife as well.
The USB cap isn't that secure but I'll wait and see how well it survives on my keyring. Also the plastic is very stiff so I wouldn't be surprised if the loop snaps easily (this is just a hunch though, it may be fine).
I'm not using the drive for anything critical so I won't be too worried so long as it lasts a year or so.