They've actually partnered with TIVO to keep from getting sued I believe, so the new Comcast DVRs should work exactly like a Tivo.

One thing I like about the ReplayTV, is I don't have to encode the videos I download from it they are already mpeg2 dvd compatible. So for me it's a bit easier and less intensive.

All my experiences with making video DVDs on the PC was a PITA, but that was 4 years ago, and I'm sure the apps have improved.