Installed Vista Utimate Edition yesterday, i can't see what all the fuss is about when dissing vista, i even dissed it!. This OS is very good, and im ready to throw away XP for good. All my games run, America's Army looks better? Im using the same drivers for my graphics card i had for XP, but it has better picture quality & runs smoother - could be just me. The Menu is a step forward now no side menus all menus are combined into one. Vista Ultimate runs very quick im surprised, Updates are an improvment over XP, and what i like best is the Network, what a breeze.
Only driver problem i had was with my 5n1 Creative Sound Blaster Live. Vista installed its own driver and now has made my 5n1 become a two speaker. Went to creative website and found my sound card is no longer supported so no drivers to enable the surround sound. Still, i have sound.
No problem with games. Vista Ultimate is a beast.

Installed on machine with pretty old hardware.
AMD 2600
2gigs ram ddr 333
Geforce 6200 256
80gig hdd
PCI soundcard CB Live
Did not install on main PC as i was afraid their might be major problems since what ive read and heard about vista so installed on the above pc so if vista spews no worries. Yet i had a smooth run. Installation took approx 20min, and i chose the upgrade installation option.