Been trialing this for a while now using it as my Primary OS. (Beta 7000)
Much quicker than vista, much more stable, Have had driver problems with it but all sorted now as i have fairly old computer
AMD 3800+
DFI Lanparty Expert
2gig of ocz ram
nvidia 7600gt
problem i had with drivers were getting my raid config to work had to use 2 different drivers 1 for the raid controller (date somewhere back in 2005 - 2006) and 1 for the raid devices (date 2008) then manually update the older raid controller drivers once i got windows installed. vista drivers for soundcard work fine (onboard realtek non-hd dating back to 2006) Nvidia drivers are on windows 7 update so got them off that and seem to be working flawlessly
Haven't tried the RC 7056 yet as 7000 is stable so will do it when i can be stuffed
Or when i build my new computer in a few months whatever comes first.
Just a heads up 7048 isnt RC as the EULA states its still a beta where as 7056 states its RC