Super 4 X55 owner here. I have a Vizio sound bar hooked up to the TV via optical audio. The settings within the TV stick, but no matter what, I always have to hard power down the TV and make sure the sound bar is on before using the Television. Otherwise the sound bar doesn't work at all.
Also, does anyone have issues with the built-in Hulu app? It will get all the way to playing media and then crash. I've done everything including a hard reset, and have no luck.
I had one of these a couple years back. The price for an official Android TV system was very appealing and so was the sleek, thin design. The UI was buggy at times though and would freeze up. After ~2 months the screen developed a flicker that worsened rapidly. I had to return it and ended up getting a refund as the store no longer stocked it.