The Comcast tech just left a couple hours ago. Wasn't here very long, quick and painless. Works fine, did lock up on me once though but gave me back control after 5-10 minutes...maybe it was in the middle of downloading something. Still hasn't finished downloading the TV schedule, has up to 8PM tonight but nothing after.
One thing I did ask him but forgot to test is the dual tuner feature that allows you to record either two programs at once or rec one while watching another. He said it did, but when I switch channels after recording a program it tells me if I do it'll stop recording. Also on the back, there is only one coax RG58 connection...shouldn't there be two? One the tuner portion of the box there is a sticker that says 'DT' but maybe it doesn't stand for dual tuner.
He told me that it will pick up the HD channels for a better picture which you can tell even on my old 27". But none of the cable box features work while you're viewing an HD channel (Guide, Info, DVR, etc.) because I'm not subscribed. Plugged in a cheap $20 toslink cable I bought a few months ago for the PS2 and it works great. When I plugged it into the PS2 though the audio is constantly on/off ever 1-2 seconds. I figured it was becuase it was a cheap cable and just hadn't returned it yet, but now that I know it works with the 6412, maybe it's the plug on the PS2 then?
I'll call Comcast when I get a chance about the dual tuner issue...unless a kind sole here replies first.