The channel changing performance is promising. I’ve never used multiple tuners before in Media Center. I’m looking to give my wife nearly instanteous channel flip between two channels. Can that be achieved if we mark one channel for recording and tune another channel? Essentially forcing a 2nd tuner to be used. In this case, when she switches back to the show being recorded, Media Center is smart enough to just use the tuner/buffering already in use…without 2-3 sec delay.