I've tested it for a whole of 10 minutes so far, but for an alpha, it's excellent.
In my subjective "feel" it sits somewhere between Gnome and KDE.
Note: on my setup Steam didn't like being scaled at non-integer scaling level. It would occasionally hang the whole DE for several seconds (on Gnome it only hangs its own window).
do you have any hint on why i would prefer it over kde? i'm not a linux user right now but kde looks already the most polished experience, i don't know where it lacks :O