No, I haven't pulled the trigger on Win7 yet. I was planning to upgrade one of my dedicated XP music servers running cMP/cPlay to Win7 so I could also install XXHighEnd and compare on identical hardware and OS. But when I saw Peter's posts regarding his current efforts and impressions on the next release of XXHighEnd and XP versus the current version and Win7 I figured it best to wait for more definitive results.
I am currently running XXHighEnd 09-y4 under Vista 64 Home Premium and it sounds very musical. Unfortunately my Vista computer is not a dedicated music server and is just an inexpensive Dell computer preloaded with Vista that serves many other functions. I would probably agree with you that the user interface of Win7 is superior to either XP or Vista but I believe that should only matter if you have a non-dedicated music computer. My experience with cMP/cPlay leads me to want to shutdown and streamline the Windows bloat and unnecessary services that affect or may affect the SQ.
Perhaps you and I may be disappointed six months from now if the latest versions of XXHE still sound superior under Vista. I'm not looking forward to buying a standalone copy of Vista to install on a dedicated music server but I will if the consensus still indicates a Vista preference. I realize that Peter and all of us are somewhat pawns to the whatever Microsoft provides
.