I just received the 811 recently. My software version is 266-LADD-N after the update.
On OTA HDTV programs (such as CSI) through S-video, the video is still dark. I don't know if there was an improvement or not. It was dark before and it is still dark now. My previous 6000 and my regular Tivo tuner are both MUCH brighter.
I only bought this thing for OTA SD and HDTV recording via S-Video to a Tivo with occasional sat viewing (I have another 301 for that). This problem makes it virtually unuseable.
I talked with someone in the Executive office. He insisted that 266 fixed the dark video issue. He said that I could try an exchange if I wanted. I guess I'll try an exchange first before I give up and have to return the receiver.
If 266 was the fix and they think they have got it, then why am I and others still having the problem.
I think everyone who still has the problem should call and ask to speak with the Executive Office and inform them that the problem still exists. If that doesn't happen, I think they may blow off this issue. After all, if 266 was supposed to fix this and they don't know it didn't, then there is no reason for them to continue trying and put any more fixes for that issue in future releases.