I have a pair of 36 gig 10k rpm U160 Fujitsus. Last week I also got one of these 8 meg cache WDs to give it a try. 1) Yes, they're very fast. The access time isn't much slower than my SCSIs are, and for "single drive" functions (moving files around, etc.), it's great. 2) Despite that, no matter how great the drive is ya can't really overcome the inherent limits in the IDE bus, it's still sucking hard on CPU time and takes forever to copy from drive to drive :\. I guess the final answer is "I dunno". If you wanna save money and get similar speed, these definitely aren't bad. I don't expect them to last as long as my SCSI drives do either honestly, no IDE drive I've used ever does. But then again, for only 100 bucks for an 80 gig drive, ya could just use the hell out of them and then throw them away after you break them and get more ;). When I shelled out the 800 bucks for my SCSI setup, before these drives were out there, it was clearly a good choice to make. I like the speed, and I like not having my computer being worthless while it takes a crappy 7200 RPM drive 20 minutes to move a few gigs of files around. With this WD drive I have to admit IDE is almost tolerable again, though.