Got 65NU8000 about a month back and so far I'm quite impressed with the TV. I did find HDR a bit dim initially but after changing picture settings to my liking, it's quite good now actually. Upscaling is very good. Don't see any input lag issues while gaming.
However, Recently it started making clicking sounds when I turn on the TV. Like a plastic clicking with thermal expansion. Other electronics make it too but not this much. It clicks fairly regularly for about 30 minutes, After that the volume and frequency of clicking reduces. I can only hear it when there is no audio playing. Upon doing a Google search it turns out it's a rather common problem with this TV.
RTINGS review also mentions it under 'Build Quality'. For me this clicking sound is a turn off but I'll have to get used to it otherwise its a great TV for the price.