I have Vista Home Premium on my machine. I'm kind of 50/50 because their are somethings that I absolutely love (Aero, how responsive it is on a Dual Core, WMP11, Media Center) and some that I detest (User Account Control, the new Start Menu). Overall, it does what I need it to do, so i'm not complaining. I'm yet to find a bug actually, everything I have used it for works fine.