Ok, So I bought the thing, and have answered most of my own questions from my earlier post. (thanks on the airplay to zone2 answer krutsch - that was the tipping point)
That demo mode nonsense at the first start was confusing. Mine wouldn't work right until the mic calibration was done. New buyers - be prepped to plug that mic in asap. (my demo mode: off attempts didn't want to stick for some reason - who knows, maybe it was just me)
Ipad app is GREAT, but can be pain in butt trying to connect. Can't tell what the issue is, but since I put in the receiver's ip (instead of having it find the avr automatically), it hasn't come up with the error any more. Receiver really ought to give you a way to re-request your dhcp-set ip from the router straight from the network menu, It felt like all it was, was ip confusion between the app, and the AVR not brodcasting.
Arc is pretty cool, but certainly a little confusing, and INCREDIBLY not documented by manufacturers. "It has arc, you can use it" is about all my tv said. Replaced TV at same time (got the LG 60LM7200 - I'm liking it as well so far) I had to turn on hdmi control on both sides (and named differently on both) to actually get things working correctly. Arc being on on the tv and receiver wasn't enough. For those that care as to why, I couldn''t run my xbox through AVR in the closet because kinect cable won't function at that distance, so arc helps out there. All other sources in closet > receiver > tv. Xbox by tv > TV > receiver. All working great.
For those of you who use it as video switcher, but do NOT always want the sound playing out of your speakers, I don't think there's a discrete button for the HDMI audio switching on the remote. Logitech stuffed the codes in my harmony profile though, and now I have one button access to it, instead of having to delve into the pioneer audio menu to make it happen. Greatness. Now wife doesn't give me dirty looks when she turns tv on in morning and sound doesn't work. (crank it into wireless headphones at night quite a bit & don't always remember to set it back to hdmi>through)
Oh - in that vein, here's a link to get the Pioneer discrete code list for those of you with harmony's or any other remotes who might be able to use it. There's a ton & its great to see a manufacturer provide this info. Line 321 or so for the codes I was talking about.http://www.pioneerelectronics.com/PUSA/Support/Home-Entertainment-Custom-Install/IR+Codes/A+V+Receivers
The sound? - No clue - haven't really got to test it yet. : ) All the other setup / stuff has taken up my time. I'm sure it'll sound great.
For 350 & change (BB pricematch), this was pretty much a no brainer. All the important things I used from my Elite-21, 3d capable, airplay built in, and an ipad app to boot, for 1/3 the price!
Looking forward to using it & checking in here from time to time to see the latest.