I just recently made the plunge into a PVR with MythTV and though perhaps a TiVo would have been easier to set up, I am really enjoying the usefullness. I can set it to record a show and then watch it later without the commercials. I can record movies off of cable, transcode them to DivX, and store them for later if I want. I can grab all the episodes of sci-fi channel shows I want without having to find them in a tv guide. It quickly changes the way you watch tv to use one of these PVRs.
Do you use one?
Do you use one?