UnknownUnknown
Recommend trying anyway, single client runs perfect. However if you plan on running multiple clients it is still worth testing.
Original client is fine (or first client launched) but subsequent clients have no ground/floor textures. Does not matter which proton version. Suspect AMD issue as talked to one other AMD user with similar issue.
Expected to jump through hoops, but it "just works!". Recommend for sure.
I'm using a native 3200x1800 laptop display running at 1920x1080 via xrandr --output sDP1 --mode 1920x1080 just for gaming to make it usable, and both windowed and borderless windowed modes work fine.
Going fullscreen however (at 1920x1080) I could only see the top left of the screen as it spread beyond my desktop and looked al pixelated and large.
I have not investigated further as it works fine for me in borderless windowed mode and lets me switch between i3 workspaces instead of alt-tabbing out.
Fedora 29 + GNOME 3.30.2 Proton 4.2-2
FPS tends to stay within 20-26 (would say a bit less than on KDE), yet sufficient to do a PvP duel, which I lost.
OpenSUSE + KDE 5.15.13 Steam compilation from 4th April 2019 with Proton 4.2-2. Game works exactly on Windows, didn't noticed anything dissimiliar to what I've encountered on Windows 10.
Noticable FPS drop encountererd during gameplay, used as much minimum settings as possible (although plant rendering is on and low-quality robots are off).
Unknown(2+ hours with Proton)No tweaks needed runs perfectly for now.
Unknown(2+ hours with Proton)
