I got one running right now. I wanted a 36 GB drive but the comp store I go to didn't have them in and this was their last 74 GB one. I got a bit of a discount, only paid $370 cdn (still ouch though). This thing is fast. The sandra benchmark shows it as slightly faster than 2x 80 GB ATA 100 raid 0. Pretty damn sweet.
It's idle noise is very very low, but you can definitely hear it loading. I did a defrag and it chattered away quite well.
Just a quick qualitative idea of how fast it is: I was playing some half-life (single player going through it) and you know how it stops to load every once in a while? Well with this drive that load time lasts about 0.2 seconds by my estimate. It's really more like a super small lag spike when playing multiplayer games. Also, CS maps load in noticeably less time than on my old 80 GB WD special edition. I'm always the first into the new map now.