I've been daily driving a work laptop with Wayland for over a month now.
the good: it works! and KDE works well with it, plugging and unplugging HDMI cables always does the right thing, scaling with different monitors looks okay too.
the bad: every time I need to learn how to do something I knew how to do on X11 (e.g. custom keymaps or xrandr voodoo), I need to learn a method *specific to KDE* because there's no DE-agnostic tooling.