KDE Plasma 6 on OpenSUSE Tumbleweed
cubiclenate.com
cubiclenate.com
It also really sucks that the documentation for KWin scripting hasn't been updated, but I get that they had little time to prepare for the big release (only, what, half a year? Impossible to update docs on such short notice).
But Plasma 6 doesn't crash anywhere near as often as Plasma 5 did when it was newly released, so at least by that metric I'd say it's better. But the greatest improvement is probably whatever magic they did in the hotkeys handling. Launching an Emacs client with Super+E now just works, that's wonderful.