I installed yesterday on my main games PC - yes a bit crazy but ultimately wanted to see if it has the same flaw in video playback that XP has with an X-Fi Titanium. So far the problem hasn't come up although I've lost digital pass-through on the audio

Aside from thaat, new windows is great. Its like Vista (which I hate) but feels faster and smoother and so far hasn't crashed yet (touch wood).
Finally an OS to replace XP - only the first beta, but so far very impressive. Was on CS last night, a few graphical glitches on first map but after that was fine, easily on par with XP performance. Call me nuts but for the time being I'm going to use for everyday use

edit - was just messing with some settings and digital pass-through is now working perfectly!
