I have ARC on my setup and it works great. Panasonic GT50 to a Denon 4311. It was tricky to setup, but once I did, it works flawlessly. I use my phone to browse for a YouTube video, throw it to the TV using the YouTube app on my phone and the app on the Panasonic, then the Denon automatically switches the signal and picks up the audio from the TV as opposed to the cable box or whatever source I was on. Only problem is that I think the YouTube app and Netflix app on Panasonic doesn't do 5.1 audio.
System Components: Custom Silverstone/i5/SDD/16gB/GTX1080 HTPC Denon X6200W in 5.2.4 Emotiva XPA-7 Gen 2 2 x Paradigm Studio 100 V3 Paradigm Studio CC-570 V3 2 x Paradigm Studio 40 V3 4 x Paradigm AMS-100 Ceiling 2 x Paradigm Seismic 12