I bought 706. Sound is good, but i have problems with component -> HDMI upscaling. When unit gets warm, sudden HDMI signal losses become usual and picture on the plasma disappears for 3-5 seconds or so. Possibly overheating problem. Cant recommend it...
I had problems with component -> HDMI upscaling. HDMI signal blanked out when receiver warmed up. I changed the receiver and new one doesn't has this problem. Aso everything else is fine, including Audyssey.