I tried 2 XB270HUs. I've sent the both back to the webshops where I bought them.
You should lower the brightness. 20-25 is good enough under most circumstances. Certainly when you are playing in the dark. You could go even lower maybe. The glow/bleeding problem should be less then. But it will still be there.
I'm still not clear myself if it is ips-glow or backlight bleeding. I think it is a combination of both. The effect is that the corner(s) is yellowish, even when it is supposed to be black. When I moved my head, so it is right in front on the lower right corner, the yellowish tint would disappear a bit, and the screen would look grey. I think the yellow color is ips-glow. I think the white color is backlight bleeding. They multiply each other.
If find it weird that it is almost always the right lower corner. And the other corners on almost all screens have this problem a lot less. It makes me wonder if the placement of the buttons (lower right) has anything to do with it.
Some people say they don't have the ips-glow. I don't believe that anymore. I just think those people don't play dark games. And don't watch dark movies on their monitor. Or maybe they have their PCs in a brightly lit room. I think all XB270HUs have the problem. Just some people are not bothered by it.
I play a lot of dark games. And I like to play in the evenings and in the nights. And the room where my computer is has very dimmed lighting. I found the glow/bleeding unacceptable. It was as if a bright spot-light had been pointed at my right lower screen, and it brightly reflected into my eyes.
I've read a lot of people saying that indeed this ips-glow is a well-known drawback of ips-technology. I don't know if all panels by all manufacturers have the same amount of ips-glow. But I'm not taking any risks anymore. I've just accepted the fact that ips-monitors are not for me.
After I tried the 2 XB270HUs, I started to hope that we would get a gaming monitor with a VA-panel. VA-technology is supposed to have similar colors as IPS-technology. But much better contrast, and much better blacks. A week later my prayers were heard !!!
Check out the upcoming Acer Predator Z35.
35 Inch, curved screen, 21:9.
VA-panel.
144 Hz and G-Sync.
Nobody knows whether it will have ULMB or not. It's 144Hz so it would be possible.
Resolution: 2560x1080.
Expected release: nobody knows, I've heard dates from end of May till September.
A lot of people think the low resolution is not good enough for them. Maybe not for them, but I don't mind. A 21:9 34" monitor has the exact same ppi as a 27" 16:9 monitor. So 35" in stead of 34" isn't going to make a big difference. 1440p looks good, but it costs framerate. With higher framerates you could configure more eyecandy (further draw-distance, better shadows and HBAO+, more foilage, etc). I hope this Z35 will be the perfect monitor for me.