An unfortunate update!
Well, I take it all back. My 921 is frankly now a completely unreliable doorstop when it comes to OTA. For a while it seemed to be working OK. However, over the last several days it's degraded to the point where I can't take a chance on using it because it locks up my entire system so frequently. To be specific:
1) Sometimes when simply just tuning to an OTA station, it wigs out and goes to a black screen that I can only get out of by rebooting the unit.
2) Sometimes when trying to record OTA HD via the 921, the red light indicating recording is on, however the picture is locked up with a static image. Then, there's nothing I could do but physically unplug the unit in order to get it back.
3) The OTA guide simply doesn't reflect scheduled HD recording. For example, I set it to record something on channel 2-1, which is listed just above channel 2 on the Guide. However, if I then go back to the guide even just a few minutes later, it shows that the recording is scheduled for channel 2 and not 2-1. If I highlight the scheduled recording and go to edit it, it does show that it's scheduled for 2-1 and not 2. However, I really don't know which screen is right and where it will record. That, of course, is because the damn unit locked up before the recording started (again).
I called Dishnet (and after being on hold FOREVER!) they had no clue, and claimed that the 921 had very few problems at all. Guess they never heard from anyone on these forums. I'm now on hold for them again (been on hold now for 44 minutes so far here on Sunday night at 10:40pm).
So, bottom line is that I'm now having even more issues than others. I'm calling Adelphia Cable tomorrow to see what they'll offer me. I'm not paying these costs for a completely unreliable system, and thus far they've not given me any assurance that these problems will ever be fixed. Since Dish has so little network HD content, that means that my HD set would be pretty much worthless. I didn't pay this to have a completely unreliable unit. My Toshiba DLP has an integrated tuner which works great - it just doesn't allow me to record anything. Don't need Dish for that!