After some hours of experimentation, I haven't yet had a "lock-up" going to the Program Guide from an OTA channel. Seems like that problem, and it was certainly my biggest issue, has been fixed. That will make for more domestic tranquility in our house.
OTA channel lock seems the same. No better, but no worse. It did improve substantially w/ the 265 update. Now if I could just use "Recall" while on an OTA channel, I'd be a satisfied 811 owner. Of course there are a bunch of improvements that I'd like to see, but those evolved with usage and weren't expected when I purchased the 811.
I to am perplexed that so many 811 owners claim that there wasn't any change in the brightness level of the PQ using S-Video, while I saw a dramatic improvement. Note that I normally watch via DVI and I never adjusted my set, a 50" Sammy DLP, to deal with the darkness on S-Video. So when I switched the Sammy's input to S-Video, I was amazed that I found reasonably decent PQ on all of the channels I checked out. Before 266, these S-Video channels were totally unwatchable, so 266 changed something in my 811. I will admit that the S-Video PQ isn't close to my DVI output, but that is to be expected. I'll also admit that the 2700 that my 811 replaced did have a higher still brightness level than my current S-Video brightness level on the 811. However, the 2700's PQ otherwise was garbage, unless you like looking at all the pixels, compared to the 811's PQ on S-Video.
BTW, my unit is a 1010LABD, which I thought was the mark of the first generation units, consistent w/ my mid-December acquisition.