As others have mentioned, 4K gaming is pretty much non-existent (lack of UI scaling is normally the problem) so that part was not a high priority

Probably a nice screen but backlight problems on the right side killed it for me.

Seriously, for a $600 monitor the above problems are unacceptable

The infamous backlight-bleed problem is real but it is not a deal breaker while gaming

I'm amazed at how poor Asus's QC has been with the MG279Q monitor: Many other people have gotten monitors with similar problems (bad pixels, partially occluded pixels (AKA "dust" in between panel layers), and bad back-light bleed) leading one to believe that the chances of getting a good MG279Q monitor are slim to none

This corner went away at first after doing a reboot of the monitor, so I was hopeful that it would be a manageable problem

and they all had problems (dead pixels, scrambled video, losing signal).

And this could be a critical problem depending on your intended use

I have not had a problem with black light bleed but have received 5 monitors in total, all with dead pixels

monitor work great, had one pixel that was out other wise no problem

These issues might not be a problem for gamers who place their monitor on a granite table.

I can't get over how great 4k is and the size is awesome, the response time is great, and the options for picture customization is also great, I have had no dead pixels or any problems with this