I have been using for about 3 hours and not to jump the gun, but it works just fine so far. the boot time the same but apps open up faster and my cpu does not seem to work as hard doing the same things as before , surfing playing music and downloading at the same time on a 2160 clocked to 2.4ghz a 2 gigs of ram with a 1950pro vid and a new 1.5 ter bite drive I just got. This is on a clean install of vista ultimate I did on Monday so that may also be helping me. the ram us is down about 15% too on a non-tweaked system at 43% with nothing open was at 60 on clean install , I will say on first boot my core usage was at 100% for like 10 min I went and made a turkey sand and came back and it was at 0 on both cores . And has not gone above 20 yet, lol I think they got something right folks. I would not be afraid to try on a clean install. As that is what I can talk about. But I never had any of the issues with vista that I have seen on the net besides it being a resorce hog. Lol well good luck to all those that are brave enough to try!!!!!!!!!!!!!