I just received my Samsclub.com online order of this set yesterday. For the money, it certainly seemed quite the deal! I am replacing a M550NV in the family room because this set will perfectly fill the opening and I just couldn't pass it up.
Current setup - all run through the Denon for HDMI control and connection to TV
- Denon AVR-891
- M550NV (HDMI1 on TV, TV on Denon)
- DirecTV HR24-100
- PS3 (fat)
- WII
With the M550NV connected, all is working great with respect to CEC, power on/off, switching between OTA and HDMI and sound via the Denon, ... Also have a exact setup in the game room using the 65" 3D of 2 years ago to make it easy on those technically challenged and it functions as expected!
Soooooooo, I un-boxed and manhandled this beast into the enclosure, replugged the Coax, HDMI, ethernet, and power, then completed the initial setup. THEN went to bring up the menu to setup the CEC and oh my gosh was the response slow. 15-30 seconds and MORE at times between button press on the remote and activity for the menu. After finally setting the CEC, it was again SLOW. The TV will actually turn on, the sound will come through the TV speakers for 5 seconds or so and then you'll see the Denon turn on and take over the sound. WORSE yet, at times the TV will switch the input from SAT/CBL on the Denon to TV even though the input selected in the TV is HDMI, not TV (meaning it should not signal to change anything). And I hope you saw the "at times". That's even more scary that it seems random. Now to add one more scare, if the TV does properly power the Denon on with the right input (to be read do not instruct a change) and then you pull up the menu, the TV will instruct the Denon to switch to the TV input for ARC.
This behavior also occurs using the side buttons instead of the remote. Have also "played" with every combo of CEC settings I can. For instance, the 65 3D in the game room functions with CEC AND volume control set to on, the M550NV functions with CEC ON but volume control OFF, and the M650VSE works "best" with both ON, similar to the 65 3D. I also played around with audio out settings of OFF, PCM, and DD in the various CEC/Vol CTRL permutations.
I contacted Vizio support and after an hour, they want to schedule a replacement. Now I'm not too keen about a refurb at this point so I'm hesitant. I'm pretty sure when they call me to schedule I can take care of that (insist on a NEW product) as I did when I got the M550NV replaced. Had very similar CEC issues with the M550NV, they swapped me a NEW TV and still had the SAME problems until about a week later a firmware update came down the wire and everything was AOK. I explained that to the tech but he didn't seem to understand when I asked him when this firmware was released and are they working on any known CEC issues. When I get the call back, I'll try again. My current firmware is 2.31.447 (the tech had a lower rev listed as the most current. BTW - it just took > 2 minutes to pull up the menu to get this FW rev and the TV switched the input on the Denon as the menu displayed).
SO - was shocked to see no CEC discussion or sluggish behavior in this thread. As an owner's thread I would have expected much more of those topics than who has it on sale

Is ANYONE successfully using CEC and if so, what are your experiences, setups, ....?
Edited by rakstr - 11/28/12 at 7:18am