I purchased a TX-SR706 around a couple of months ago and so far, it seems decent, but I will be getting warranty work done on it at a local authorized Onkyo service center soon. The volume knob doesn't work. Apart from that, I've had a handful of video problems that I have so far only noticed when watching cable TV, with many of the symptoms similar to what Merlin803 experienced in post #2337. The receiver is connected to my Samsung LN52A540 TV via HDMI, and the cable box is connected to the receiver via HDMI. I also have a PS3 connected via HDMI, Wii connected via component, and my laptop docking station connected via VGA and RCAs. I won't declare the video issues to be a problem just yet until I test out more sources to isolate the causes. On rare occasion, I notice what is best described as a framerate drop for a brief second or two while watching cable. In that brief moment, the video seems to play in slow motion. It's very noticeable during football games when it happens. I've also noticed that Family Guy on TBS (but not FOX) will sometimes tear like v-sync is off when playing computer games, but looking at the TX-SR706's manual online just now, I see a film mode setting under the HDMI setup that I need to double check when I get home. It's currently either Auto or Off and I don't remember which. All other HDMI settings are default according to the manual.
So as to not alarm anybody just yet, I will also be testing a few other video sources as well, including DVD and hopefully borrowing a Blu-ray from someone, and provide an update on my findings. I can confirm that no such "framerate drop" problem seems to exist with the PS3 when playing Metal Gear Solid 4 or when using the Wii or PC.
I've yet to get my home theater working in full swing, so there's little else I can say about evaluating the TX-SR706 otherwise. I still have surround speakers that need to be hooked up, which won't happen until I get the in-wall wiring done, so I have nothing to report as far as the audio settings are concerned.