We use Velociraptor drives in our workstations at work, 3 of them, all of the original ones have been replaced. Not sure if it was the way the workstations were build, they are custom, built before I got there. we have nothing but trouble from two of them. Warranty was easy on replacement, just went to WD website and punched in the serial #s and they sent a new one, and I sent the old one back. pretty easy.
They are faster than normal drives, but I did put one in my home machine and now it is sitting waiting on me to replace the drive.
They are good drives when it comes to speed, but I have had to many failures. I do not think I will be getting any more of them