I've been using the QIP7100 1 for over a year now, and recently Verizon has offered me DVR free for a few months, and I received a QIP 6416-2 on my doorstep a few days ago. Reading about the differences between them, it seems they're mostly equivalent, although the QIP7100 1 supports MPEG-4 decoding.
Is it worth "downgrading" to the QIP6416-2 for DVR? Maybe a different/better model should be requested?