I'm thinking of going back to Comcast, but I'm wondering about having only 2 tuners. Currently, with my 922, I record most of my prime time shows OTA which leaves the satellite tuners free for a cable channel or watching a basketball game. Can most shows be found for free in Comcast's On Demand if I wanted to watch a game and had to cancel a recording? What are the holes in Comcast's On Demand content?