Had technician come out several time. He says something about Roku and Star Communication not working together with the 4K model. Mouth and words not in sync and it will freeze and green bar shows up on bottom of picture. Star say they have a ticket with Roku, but no response.
The Roku was easy to install and I was able to add on apps like PBS. The Roku linked to the added apps easily. The channel or station has to have an app for you to watch it on Roku.
I have owned several ROKU products, going all the way back to their earliest boxes (pre-Netflix). When comparing to the apps on my smart TV, Roku has better picture, better speed, and better sound. The interface is easy, usable, and not nearly as busy as other platforms. If you are a cord cutter or streamer, this is the best platform available.