I've had my 9242 for a week now and can say it's a great machine the dual HD recording is great. I had a 6412 with Shaw cable and it blew big time Audio drop outs, picture problems, in the end it made me nuts.
I haven't had a single problem on my machine with any audio or video issues. I watched terminator last night on the CTV E feed and it was perfect. my signal strength is roughly 83%
I wonder if some peoples problems are related to there signal strength or just a bad machine.
The only picture issues I've noticed are the compression that people have talked about, I don't really know if it's bell ( I know bell compresses) picture quality or the feed, Terminator last night looked pretty good, American gladiator on NBC had lots of macroblocking in anything high motion i.e. graphics.