The Logitech Revue screws with the audio from the source, outputting PCM thru its HDMI output, instead of bitstream. It will annoyingly take a perfectly good DD5.1 signal from your source STB, and turn it into compressed, lifeless, stereo crap. And, because it's a 5/7.1 PCM signal, even though it is using only 2 channels of it, it will remain stereo from your AVR, as Dolby PLII will not enhance what it thinks is already 5/7.1. For that reason, I have my living room GTV setup as a standalone source device. I do not pass any signal thru it from my source DVR. (My BR unit is setup in the standard pass-thru configuration, as I normally just use the TV sound in there.)
The "beta" update that Scott found on his Revue does not fix this glaring audio design flaw. (I might or might not have the same update. I'm not at liberty to say. But, I do know it doesn't fix it.)