I asked for a feedback from a vizio P series reviewer. He sounded like he knew his stuff about 4k and was very scrupulous with details. I asked if he had ever seen ultraflix. He said he just got it with a recent firmware update. Though he said there is still limited titles, he said he watched all the free ones and the video quality looked "wow" from 6 feet and even all the way to 15-20. He also said compression was more in YouTube and Netflix than with ultraflix.