Among 27-inch QD-OLEDs this is the one people keep landing on, and the owner reports are unusually consistent: the panel is excellent, the picture out of the box is better than the obvious alternative's, and two specific problems decide whether you keep it.
The first is variable-refresh flicker. It shows up in menus and in dark, low-frame-rate scenes, and while some owners never see it badly enough to care, others have gone as far as turning G-Sync off — one player running around 350 fps in Dota found the fog of war unpleasant to look at. Firmware and cable changes help some people and not others. The second is a quality-control question: enough owners report scratches, bubbles under the factory film and dead pixels on arrival that it is worth ordering from somewhere with a painless return, and worth running a full-screen colour test the day it lands. A subtler variant of the same thing is a fine vertical striping on dark content that survives every cable and port swap and appears on some units only.
Who it suits: someone who plays fast games in a room with controllable light, wants explicit burn-in warranty cover, and is happy with 1440p sharpness for text. Someone who writes code or reads all day is better served by the 4K 27-inch panel, and someone who cannot dim their room should look at a micro-textured matte WOLED instead.