Well, I have a LOT of problems with the connectivity of this monitor.
I can't use HDR, it periodically disconnects going to "no input" and most of the time recovers after perhaps 1-2 seconds, but other times doesn't recover at all. This occurs even on the desktop or when doing something simple/non-fullscreen such as Youtube. In games it's every minute or more.
Changing from the default of 4k60hz to 4k 120hz I found it randomly disconnected, sometimes Windows defaults to "disconnect this display" in the display panel and trying to change it back to extend would see it default once more to "disconnect" even before I could hit the "keep changes" button.
Playing high frame rate games seems to experience some stuttering at 4k regardless of 60hz or 120hz, HDR or not. Changing another resolution fixed it, and enabling/disabling VRR/Gsync compatibility made no difference, nor did setting a framerate cap or enabling Vsync. The experience is a little like every 15th frame is just skipped, so it's smooth animation that's very slightly broken up 4 times per second.
I have two devices connected, one DP and one HDMI. I have 3 HDMI 8k60 / 4k144hz rated cables including the one from the box, and two DP 1.4. When switching to the other input it disappears entirely on the initial device as if the cable had been unplugged, which results in Windows re-arranging the desktop entirely. I've used several monitors with these two devices and switch them on the daily but have never seen one behave like this, even my GN850 (which coincidentally I haven't had a single issue with) doesn't work like this.
I've updated the firmware, installed OnScreen Control, Installed the UltraGear Control Center, installed the monitor drivers specific to this model, updated my 3070 drivers, reset my 3070 drivers to default settings, reset the monitor to default settings, changed the cables, tweaked the nVidia settings, played around with Windows settings and isolated the power socket to its own plug. As it stands, I cannot use HDR, I can't increase the font scaling beyond default, it still disconnects entirely when switching source and I have the stuttering in games. But I do have freesync and 120hz 4k enabled now which is about the best picture quality I can achieve aside from the stuttering.
I'll play more at a later date. I expected maybe some issues from what other people have said on this thread, but I did not expect anywhere near as many finnicky little problems as I've had, especially when I have a GN850 right next to it which works flawlessly.