I'm finally taking the Tivo plunge (I've held off, planning to go satellite and get the combo DVR/sat receiver for all our viewing rooms, but my wife finally wants Tivo for Christmas; we still have cable, our internet hookup is cable, and Comcast finally has Extra Innings, so there's no compelling reason to switch tp satellite). However, I read somewhere that the standalone Tivo units don't work with cable HD. Is that true, and if so, why? Haven't found an explanation anywhere. I was planning to upgrade the digital cable in the family room to HD for the upcoming bowl season (we already have a Sony HDTV). But now I'm concerned that the Tivo unit will be "wasted", or I won't be able to upgrade to HD to keep the Tivo working, if what I read is right.