"Tivo or Not Tivo, that is the question..."

 My old DVR is on it's last legs. It was a Sony model that is no longer manufactured and Sony no longer supports. So I've got to move on to a new one. I've seen Tivo all over the place, and people rave about it. But; what do you guys think? Should I try it out, or just get the Cable company's DVR instead (my cable company is COMCAST). I believe my cable company's DVR is a Motorola.

Any opinions either way???