I've got a TiVo, and while it has a nice interface and nice plugins for Netflix, Hulu Plus, YouTube, etc.., the box or s/w is junky. It crashes at least once a week and can't stream worth anything.
Slightly offtopic since it doesn't pause live tv, but I did pick up an apple tv yesterday and am really liking it. Plus, I hear you can install XBMC on it. Win.