I bought this like a month ago, the 4K is amazing. The Os super easy. Tons of free stuff, compatible with HomeKit, AirPlay, Chromecast, Alexa and much more.
I purchased this for my parents about two weeks ago... And they love it. The UI is very easy to use for them and now they no longer have to turn on the Blu Ray player to be connected to Netflix, Hulu, Vudu and even YouTube.