Adelphia (Thousand Oaks) installed the BMC9012 Friday morning (27th). Here are my first impressions:
The installer was fairly good and had done it before. Naturally, the line wasn't properly provisioned, so there was a wait, etc. but within 45 minutes or so, it was hooked up and running. And, they include the component video cable, which is nice.
But, no viewer manual was included. (sorry, but the "Intro to Moxi" video doesn't cut it. I want bedtime reading). I did find one at the digeo website, but even that doesn't really do a good job of explaining the various modes and how to effectively use the box. And, trying to call Adelphia for customer support is a real non-starter (they try, but it's obvious the people on the phone have never seen or used one of these set-top boxes.. they actually sent me to the Motorola website!)
HD is great, when it appears. Too bad Adelphia only carries CBS,NBC,ABC, KCET, and ESPN-HD. It would be nice to have Fox and KTLA (the other local HD broadcasters). And, of course, the HD offerings are spotty, but that's not Adelphia's problem.
It's unclear which output resolution from the Moxi that I should use into my Samsung DLP. Not much visible difference between 1080i and 720p.
Integration of the plethora of remotes is a pain. I've got the Samsung remote (needed to select which input to use (RF,Component,DVI) , and to turn it on and off. I've got the stereo remote (to select which audio, control the volume, etc.), the DVD remote, and now, the Moxi remote. I haven't trudged through all the alternatives of programming macros and combinations, etc. yet., but I'm hopeful that I can come up with some sort of useful strategy.
The SD output of the Moxi is, to put it mildly, hideously bad quality. Not sure why, but I'm much better off using the RF tuner in the TV. Makes no difference whether I use component (presumably upsampled), composite video or RF outputs from the BMC9012, they are all horrid, with quantization artifacts, screwed up color balance, etc. (and, of course, this applies to recorded programs off the DVR... making that function of limited usefulness). Arguments about needing to do A/D: MPEG2 compression, decompression

/A are bogus, in my opinion. Clearly, one can get an acceptable signal in 4.5 MHz of analog bandwidth with the RF. One should be able to do the same with modern A/D and signal processing hardware.
It's trivial to do an A/B comparison between RF and composite video (or RF) coming out of the BMC9012, because you can set up the Samsung for split screen. (one can also see the several second delay through the BMC9012 with this, of course)
The audio level (digital output) on the HD channels is fine, but the level is 15-20 dB higher on the RF channels (1-100), so if you switch between an HD channel and a SD channel, you either get blasted or can't hear anything.
I haven't tried recording and playing back to see if there's the same difference.
If I had to guess, there's some digital encoding options on the SD channels that are screwed up. There's no reason for it to be that bad.
I don't know how it handles it when the HD channel reverts to SD when recording (the NBCHD reverted to SD for the closing ceremonies.. I'll check it tonight).