I have a Mini-LED HDR monitor (Acer XV275K P3) and it looks great. It gets super bright with black blacks. I didn't want to risk burn-in, it covers the full 1000 nits that most HDR content expects, and it was only $550 which was quite a steal. There's occasionally a little blooming in dark scenes in movies, but in games it never gets that dark and there's mostly very bright things instead.
I have HDR working on Plasma 6 with an AMD gpu on NixOS, although recently Gamescope/Steam has been a bit bugged. MPV still plays movies perfectly though. I even set up inverse tone mapping so SDR videos get converted into HDR, which looks a bit better than normal SDR imo.