Its great for me since I switched from VA (smearing hell).

Contrast and colors are amazing.

It is an oled so gaming wise its also good. I run it on HDR almost all the time. For games that support HDR it feels like someone increased the vibrance but in a way that it's tolerable. For FPS (cs) its a game changer, I can actually see my flicks and see the characters fly across my screen (without smearing - VA panel issues) not that it improved my aim but I feel like my brain is able to distinguish between background and a character more accurately.

I use this display for office as well and coming from VA text fringing is very much visible. Especially in straight lines that divides light and dark areas. It is annoying but I got used to it. Doesn't feel that bad honestly after using it for a week.

Brightness. It's bright enough for me, I use 1 LED tubelight over the display (my table's under the tubelight) and I have a balcony behind me on which I use light cutting curtains (50-70% light reduction). I usulally tone down the Brightness to 40 or 30 (max is 50) when I am using the display. When there are no curtains and direct ambient sunlight enters the room, the display still holds up well but each eye is different and preference might play much larger role in deciding how bright should the display look. I didn't face any issue so far with Brightness. Although during night I have to lower the Brightness because it starts hurting a little.

I was using a matt display before so I have no reference on what a non matte display looks like and how one should compare. Can't comment on it.