One change that seems to have happened with 3.66 is that the 622 now keeps you on the same channel. Used to be you would put in standby on a channel and when you turned it back on you got whatever tuner 1 last recorded. Now it seems to remember what you were watching last time you had the 622 on and tunes you back to that channel, even if tuner 1 is busy it must use tuner 2 to bring it back for you.