There are aggressive fans of both the TiVo and the new DirecTV only systems, like the HR20. We have both, and I still prefer the TiVo system and software because I get my HD local channels on an antenna just fine and do not need DirecTV to rebroadcast me a compressed version of the original.
Starting the debate again about which system is better is like shouting "Fire!" in a crowded theater. You will get pandemonium, but it will not change anyone's opinion or what they like. The hot wind will be fierce, though.
Still, you must realize that the days of we TiVo fans are numbered-DirecTV is slowly making changes which will ultimately make our beloved TiVo boxes obsolete. The good news is that they cannot replace all the TiVo software boxes now, so they still support us.