said by andyross:
Just note that with Tivo, you don't get OnDemand.
With Tivo you don't get Comcast's onDemand, but you you get on demand videos through Netflix, Amazon Video, Blockbuster Video, Hulu, YouTube, etc.... which you can't get on Comcast's box.
You also can't digitally transfer videos off a Comcast DVR to your PC, iPod, or other devices like you can with a Tivo.--
If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.