Although I did see a slew of negative reviews on 150GB Velociraptors. Quite a few people on Newegg commented on DOA and early deaths. (within a couple months) Then sometime after that Newegg started selling them factory refurbished for quite cheap. That makes me think that particular model had a factory defect that had to be fixed.
I have not heard any complaints about 600GB and 450GB Velociraptors.
True. But they're usually cheaper than other enterprise class drives.