I had the 43 model and was trying to use it as a cheap pc monitor but ended up returning it. I think it is quite different then the 50inch version you reviewed. It had a weird cross hatching dithering pattern, and the contrast ratio was around 3000:1. Input lag at 4k was much better then what you got on the 50 inch version. The tv always had a piece of glass in the front which made it warped the corners of the picture and seemed to wash out the picture more with internal reflections.