Well folks - I spent ages looking for reviews on this drive and in the end, decided to simply pay the money and buy the 320GB version.
No problems with noise. It's quieter than my previous Diamondmax 9 drives. It's also quick, HDTach results are:
Burst 262.0 MB/s
CPU Util 4%
Ave read 65.3 MB/s
Random Access 13.3 ms
Motherboard is an Epox 9NPA+ Ultra which supports SATA II.