DR Singdaw, I can't have any opinions about Tivo since I've never owned it. Those who have it swear by it.
Our cable service (Time Warner) offersa DVR with their digital cable boxes which offers two tuners and thee ability to record high definition channels. This is what I have, and it's wonderful. When you research Tivo and DVR, you need to keep in mind that Tivo requires a phone line connection (at least I believe it does; talk to others here who have it). The DVR requires only the cable connection. Some Tivo models offer more features than others. Again, the two technologies are similar but not exactly alike, so you do need to think about what you need from your recording device, what equipment you have (or want), and how much do you want to spend.