Holy zoooooming christ!
With the old RAID Mirror, VS2005 took ~10-20 seconds to start up. Running from the Raptor drive, that's down to 2 seconds!!!
Both are timings from freshly defragged partitions... of course the raptor does have an (unfair) advantage in that windows is freshly installed without too much crud. Timing from the RAID was without any antivirus software installed, though.
I'll have to try again once I've got the system more loaded, but things do seem sweeeeeeeeeet so far! And the drive is really silent, I was afraid of 10,000rpm but appearantly that's no problem. It's (a good deal) more noisy when there's heavy head movement (as in very random seek patterns, copying a non-fragmented 4gig file doesn't cause this), but that's not a problem to me; besides I've had much noisier drives in the past, and it's probably fixable with "acoustic management" anyway.
Yay, very good purchase so far!