I've tried it.
Video card acel for the desktop seems to be broken, well atleast with current drivers i.e drawing things is quite slow.
I got some nforce drivers that works for everything pretty much, but sound skips.
It starts up pretty fast, but once you're on the desktop it like will do nothing for a while and then start to load things for a few minutes.
Ram usage is pretty good, with 512 ram just messing around it doesnt page.
At this stage its just fun to mess around with because some things obivously dont work, being beta 1.
Beta 2 on windows xp was pretty much all working so I hope vista beta 2 gets to where msot thing works by beta 2 or 3.
shutdown and reboot doesn't work for me, it goes though the process but doesnt shut of my pc or reboot, it justs goes to a blank screen and I hear my hdds shut down.
I am looking forward to more mature versions.