The activation process for the Tivo with cable card and Comcast took over 3 hours (I started at 7:00pm and went to bed at 10:00pm with no channels yet, but the next morning all was good) from the time I activated it to the time all the channels were loaded and I could actually watch TV. I had done Guided Setup prior to getting the cable card and when I called I was specifically told that I MUST redo the guided setup from scratch (and if I had the Tivo for more than 2 weeks that I would need to select "delete everything" so that there are no random bits on the hard drive to corrupt the new settings. But, with the cable card installed and completing guided setup again just me no installer or anything (just the activation line), it just took a insane amount of time before channels were viewable. I also had an issue with my router and cable modem (ala comcast) that I needed to reboot all of them in addition to the Tivo. The odd thing is now I occasionally get shows downloaded that are in my subscription list rather than being recprded as they are broadcast.