I bought this to replace a 39" Seiki 4k display from several years ago which suffers from terrible input lag, and i had a super annoying dead pixel. Overall I’m pleased, but there are two drawbacks I’ve noticed: 1) The edges of the screen reflect the bezel, such that for me, the far left and right edges of the screen aren’t visible without adjusting my viewing position. I sit about arm’s length away from the screen. 2) The screen is very reflective, such that other monitors opposite it sometimes cause reflection.

On the positives, it fires up right away, works reliably, looks good, sharp text, etc. Input lag is very low, I cannot tell a perceptible difference with my regular 1080p monitor which sits next to it. However, I will note that at 4k30hz, the input lag is just as bad as I had on my Seiki. So make sure you get the proper connections to drive the display at 60hz.