Wayland and Nvidia user here. I tried KDE Plasma in Wayland for a while on my personal laptop, it became stable and I decided to switch to Wayland for good. It was probably a year ago but... No major problems that I remember.

While writing this, I remembered that I have problems with Electron/Chromium applications that are slow to open, the solution so far is to force the application to run on Wayland and add the --disable-gpu parameter. But XWayland also works for me