I have a Tivo Series 1 unit (from 2000), and a Series 3 HD unit (from Sept 2006). I love them. They are indispensible. Far better than any cable DVR. They are near the top of my list of can't-do-without consumer electronic devices. Is that a superlative enough of an endorsement?

Your Series 2 DT unit is a great unit. If you have or are considering going HD soon, you should have a Series 3 instead.