Love my 622, great interface and its quick. No real complaints other than I wish I could stick in a bigger hard drive or transfer it to my PC but doesn't seem to be an easy way to do that. I don't know what bugs ppl get, a few times (maybe 4-5 in a year) I came home and turned it on and it gave me an error message saying data was corrupted and had to format the drive and to press OK but I said screw that and unplugged it. Booted up and worked normally I'm glad to say. Otherwise I'm completely happy with it. I had Comcast's HD DVR over a year ago and that thing was pretty quirky and had half the hard drive size of the 622, you basically can't keep anything on there. Neither is gonna hold a season's worth of 24 or whatever but the 622 has DOUBLE the capacity so thats the clear winner. Comcast HD was good and all the locals in HD was great.
Which reminds me, I do have a similar issue as you, I don't get FOX in HD in my area. Solution to that is an antenna, which works pretty good, theres potential for dropouts but its not that bad if you get a nice HD antenna. Of course if you have the roof mounted type, good for you !
Only problem is I want another 622 for my bedroom.... and then another for my HT room... ;-)