The Good:
- No weird xWayland flickering like GNOME
- Desktop transitions never drop a frame, even with 1:1 trackpad gestures on my Magic Trackpad
- The kwin implementation seems to be less picky/buggy than Mutter? Might just be my hardware config, but Wayland/Nvidia/GNOME would crash constantly for a number of reasons. It all came down to random gnome-shell segfaults that I couldn't debug.
The Bad:
- Compositing/alpha effects are somewhat broken (on GTK and Qt)
- Sometimes a panel will stop responding or fail to render (or both)
- krunner seems entirely broken
Overall, I'd say it's running pretty well, and is probably better than GNOME for Nvidia users. Their work is cut out for them, and the Wayland-specific bugfixes are starting to roll in on a weekly basis. You'll probably have an even better experience if you aren't using Nvidia hardware.