Just as a comparison... The OTA broadcast of Lord of the Rings is apparently superior to the BluRay release.

The stuff on iTunes is tiny compared to broadcast and BluRay. It's also not available in 1080, while some broadcast stuff is.

OTA gets me most of what we watch. I really can't see paying TiVo $12 a month for a little box with practically no HD space though. OTA broadcasts are quite huge and I have 1.5TB of recording space that I still have to prune (or leave it set up for auto-deleting episodes).