I'll be surprised if you hear anything negative about the Onkyo receivers from anyone who's had them. I've used Sony and Onkyo receivers.
Well - I have an 875. The current 876 is almost identical.
It runs so hot that it will eventually go into shutdown if placed inside any kind of cabinet, even one with open sides. Same thing will happen if you have anything stacked on top of it. I had to place it out in the open, on top of the cabinet, to get enough cooling.
And I'm not the only one with this problem. Read the many threads on the issue.
It does sound nice, I'll grant you that.
CNet doesn't have any official reviews of the 806, but there's one user review that's a bit frightening:
"Good sound, lots of connectivity, but video problems."
by imperito on November 14, 2008
Pros: The sound is great, driving my Aperion speakers. The video conversion is convenient, I can put everything on HDMI. Configuration isn't too difficult, nice to see a menu on the TV.
Cons: When displaying 1080p video from my Xbox 360, I see blue dots on the screen during dark scenes, even with the HDMI mode set to "Through". I don't think it is doing real pass through of the video. Doesn't happen on a 720p signal.
Summary: I like the sound, and the connectivity. The video on 720p is fine.
But the problem with 1080p video is very distracting,the whole screen would sparkle with blue dots during fade to black transitions. I had to switch to using 720p.