If you care about performance at all, get the 7200rpm. It's much faster (noticeably so), copying songs into iTunes folder, loading apps, copying files, etc etc. One of my best upgrades in terms of "seeing" the improvement. The only con is battery though I use AC more often then I should, it's not been an issue. There was a chart somewhere of the power consumption of both the Western Digital and Seagates consumed very close to a 5400 when idling. Outside those brands then there is a noticeable jump in power. I don't notice vibrations, heat, or noise at all. Actually my previous Western Dig. blue 250gb 5400rpm kept making an annoying clicking sound so to me, this is even quieter =D