First impressions so far:
Colors are great, really deep blacks, and it's very vibrant on windows desktop. Was factory calibrated, but some icons still seem a bit off, may need some new gpu drivers in the future.
Build quality is OK, stand is strong, but back is a lot of plastic and input port area is hard to get to. Feels pretty much same or slightly less build quality than my $700 4K 60hz Acer Predator monitor.
Battlefield 1 looks great with HDR, when the light hits your face, you can really tell the difference. Getting around 90FPS on Ultra with SLI 1080ti.
Assassins Creed looks great too - very colorful. Doesn't support SLI, so getting 50-55FPS on highest settings.
144hz is great, buttery smooth, and no screen tearing so far.