That's too bad - but since it didn't work with the DVR+, it makes sense. I think so far, you're the only one here who's actually tried it!
I hope you give it a review on the MCM Electronics page. It sounds like the only big problem with it is the audio glitches; if they can fix that, this would be a nice way to record video from an HDMI output without a PC.
The failure with the DVR+ is disappointing, but I wonder if it would do better with an old DTVPal, or a cheap MStar box like a HomeWorX or iView. Those boxes also tune channels 52-69, which would solve any interference issues.