Just picked up one of these Hitachi Ultrastars from newegg, this was a replacement for two POS Seagate 7200.11 500 gigs I went though.
This drive is very quiet, has a 32 meg cache, seems very fast as Vista gives it a 5.9 score. I can't seem to find any reviews on it, it may be relatively new. Has an average latency of 4.17ms accoridng to newegg.
All in all I'm very happy with this drive.