I tried their experimental Wayland session and it's still super buggy on high refresh rate/high DPI screens (loads of graphical errors and artifacts) so still a ways to go imo
I tried it for a moment, made games stutter like hell, switched back. I know I need to go in and figure it out at some point, but it's hard to muster the energy when X, for the most part, works fine.
From what I've seen, it probably has to do with my Nvidia GPU.
Depends on a few things with your setup: age of your GPU, the resolution/refresh rate of your monitor. I think even the choice of DP/HDMI can have an impact too