I have been following this thread since it's inception. I have had the TXNR 818 for a few years and have always enjoyed its ability to produce precise, non-tiring sound to my Klipsch RF -7 / RB -81 / RB-61 via the combination of Audyssey room correction ONKYO processing. I now us The ONKYO mostly for a pre-processor into one Crown, amp two Emotiva amps, and of course the HSU sub amp. I use the ONKYO 818 amplifier for the high channels and the back channels (mutually exclusive in the 818 setup) - yielding 9.2 in Audyssey and other modes, and 11.2 Stereo.
I get two channel FLAC files from my PC USB via a SCHIIT DAC directly into one of the ONKYO 818 analog ports, and use Apple TV, Samsung blu-ray, and DirectTV to ONKYO HDMI for video /audio to a Panasonic Plasma TV.
I had just recently started to experience intermittent sound loss from the ONKYO 818 when the unit was powered on - although correctable with on-off cycling, it seemed to be getting worse. I toyed with retiring the unit but decided to take ONKYO up on their fix program. As others have stated, ONKYO sent me the packing box and shipping label, and I got the unit back from repair door-to-door in less than 10 days - Texas to Illinois - amazing.
The sound and picture are fabulous, and I'm doubtful that I could reproduce (for my taste) for less than a top-of-line pre-processor from ONKYO or Marantz. In any case , this experience has renewed my faith in ONKYO.