Most disappointingly, my new OSSC does not appear to work with the SNES on my 2015 Vizio M65-C1 television. I get picture but no sound (actually, there are intermittent periods of partial audio output, but it’s essentially mute). This was tested both with the HDMI audio add-in board as well as going through the 3.5mm audio jack. Also, depending on what line multiplier setting is used, the video occasionally cuts out for a second or two before coming back.
On my BenQ SW2700PT monitor, everything seems to work well!
Looks like I will be sticking with the composite input of my DLP-600W mini projector for my big-screen gaming needs.