I'm liking Katya a lot, as a matter of fact, I consider everything the Mint devs do to be real improvements over pretty much everything they put their name on!
Pretty much everything is working as expected OOTB, even Compiz. (Haven't tried enabling the cube.)
I didn't feel the immediate, pressing need to change the appearance, though I did eventually tweak it beyond recognition.
Problem is, though I like the Ubuntu-based versions, mainly for the PPAs, (specifically, xorg-edgers, which makes my ATI Radeon M7500 perform at it's best), Ubuntu/Gnome base is a RAM hog on my lo-spec machine, always getting into swap and becoming annoyingly slow. Disabling Compiz would probably help, but if I'm not using Compiz, then I'd just as soon use my Mint XFCE(Debian base) setup.
But for now, I'm enjoying Katya, in spite of my machine's less-than-optimal performance.
I think I'm becoming a full on Mint convert!