I just bought a 300gb today , I want to try RAID so maybe its probably best for that. The spinpoint is a bit loud but most of the time its quiter than normal hardrives.
May be its quite most of the time and when you do hear it needs to spin the disk faster for performance.
I read a review of it in CustomPC (excellent magazine , advice every enthusiast in the world to buy it ) It was praised highly.
Have a nice day everyday
PS. Did you know that running two normal hardrives in RAID is faster than running two raptor 10k in RAID. Weird in it, tested in Custom PC , thats where the tests are at.