The monitor is great when it works: This monitor is known to have a bad panel that Acer Refuses to fix: Within 2 years of purchase date G-Sync will cease to function correctly, causing a flashing black screen. Disabling G-Sync fixes the issue, but like many others here, I didn't pay $400 to not use G-Sync:
Acer will not pay for you to ship the monitor to them, they will only pay to ship it back to you.
I gave this monitor a good review, but that was under the assumption it was a working product and didn't have any design flaws. And here I wanted to buy 2 more of these monitors for a 3 monitor setup. I'm so glad I didn't.
Fasten your seatbelt: Acer's Predator XB321HK UHD display is about to turbocharge your gaming experience. This monitor combines jaw dropping specs. Also, featuring NVIDIA G-SYNC technology to eliminate screen tearing which provide gamers the epic gaming experience and help to secure the victory. Tilt Angle : -5°to25°