My experience for the first 6 weeks of using the MOT 6412 is very good. Quality and performance has been above my expectations. HD programming is played back as HD, and can be used as source for DVD or VHS offloading/archiving. The programming guide is very convenient. The Tivo-like functionality for live TV has changed our viewing habits. Actually, the DVR's playback quality and functions have changed, for the much better, our TV enjoyment. Combine the DVR with an HDTV and, in a word, WOW.
Here are the minor flaws: Sometimes the iguide will hang and not respond to remote commands. The MOT 6412 is not great with SD channels, so I get a better picture thru my tv's internal tuner by bypassing the box. Recording a series will result in recording the program multiple times if it's broadcast multiple times during a given day so that you then have to delete the intraday repeats. And although the hard drive is 160GB, I would like it to be bigger.