As for me...I have two SATA HDD on different SATA controllers (VIA & FastTrak) and on one XP, on another Vista (cause I don't want dual boot). I tried to set up Vista as my XP configuration, all software I have on XP, all drivers, sys config. At last I did it, I just installed new Widcomm BT drivers which work like charm on Vista. Only problem for now is BSOD when I use modem (drivers for sure). Media player freezes here and then but after I installed new version its ok. Media center is awesome (freezes 2 out of 10 times). Speed....hm...almost the same as in XP without tweaks. So I'll give it a try for week or two and then decide to format or not to format :clap: .