When I checked the USB device in the menu yesterday, there was a generic message saying something about an unsupported device and said to call 1-800-333-DISH (3474). The number L441 gives is now the RX activation number (888-241-2205).
Spoke with a woman there at 22:00 EDT and while she was working on it, I asked about call volume. She said she couldn't speak for everyone, but since coming on for the evening shift she had "a bunch of calls every hour - not too bad, but busy" and that she didn't have a 622/722. She wished she had one since it was now "an unlimited space DVR". Waiting for my evening timers to finish before formatting since it also does a reboot.
Groups are really nice, not concerned with th RJ45 just now, didn't check signal strength (I peaked with meter at dish), and no lockups/random reboots/etc. Very pleased with it with the minor exception of that "press Guide again for..." crap in the guide.
While fooling around with the USB drive, I see the stuff about Picture management too. Anyone use it? Is it useful? Handy? I've got a 50" Panny plasma that the wife would love to see slideshows on. The TV has an SD slot, but it is slow as crap using it for slideshows and it only uses about 1/3 of the screen real estate for them anyway... Like it's in PiP mode...