Thanks for the review!
I might just have to get one of those Channel Master units. I have the Zenith DTT901 and have been really happy, except that I wish that it had S-video and that the program guide showed more into the future. I do like how the Zenith lets you check what's on other channels without changing the channel, though.
I really (REALLY) wish that these lower-priced boxes had digital audio output. That's one of the reason that I put off getting one until a couple of months ago.