Hey all,
Speaking purely as a civilian and Audition 2.0 user at home, here's my personal experience and opinion on using it under Vista.
First, the new audio driver is extremely wonky. It seems to configure most device input channels as separate devices, so things can appear very weird within the WDM drivers. Some devices just list each channel separately, but with no matched pairs, others don't show up as having any input channels at all. The M-Audio MobilePre and one of the Edirol's can't record under any application I've tried.
Most devices do not have ASIO drivers out for Vista yet. Those that do have Vista-specific drivers tend to be working well.
All of this, of course, doesn't matter if you have the Aero interface enabled. The thing is an amazing CPU hog. Setting it to the Vista Basic interface is another world in performance. I think the biggest mistake Microsoft made with Vista was putting a CPU meter in the sidebar that pegs to 100% every time you mouse over the sidebar.
So, all-in-all, if your soundcard works with Vista, then Audition 2.0 runs very well with Aero disabled. But it can be a real pain to get to that point. It would definitely be worth waiting for awhile until ASIO drivers are available for your device.
durin