Got both the Rift and the Vive, set the Vive up first, and after getting it working in some other games, gave the Beta a whirl.
Pretty impressive, I have the Vive set to 2.5 pixeldensity/SS/whatever using the notepad mod of the steamvr settings file in Steam controls, not sure if it has any effect on Aces High Beta, but it looks as good as other sims/games in terms of graphics.
The hand controller interface is pretty click, a lot of future potential with these things IMO. I do find that the aircraft icons/ranges disappears as soon as the plane is 2.0 or so out in the HUD, but I'm sure that's just early days stuff, or that I have the wrong size setting in GUI or something - it's really the only thing I noticed that jumped out at me. Just flying around, looking around, is a pretty good wow factor, and this is my first day with the Vive/VR and I don't have everything optimally set up yet I think. 89fps with everything but the reflections cranked, it's two notches from the bottom, which is the headset limit, so no complaints about fps or anything. I couldn't figure out what the TrackIR setting in the VR options does, tried playing with it on and off, didn't seem to make any difference, just something I haven't read/'figured out yet I'm sure.
The Rift is better in other sims/cockpit games I've heard, we'll see tomorrow I guess, but I'm pretty impressed so far as early impressions with the Vive in AH beta.