I've finally tried KDE (on Fedora) a few weeks ago (after, like, years) and it's actually really solid, love it.

None of the BS and attitude of Gnome where they put basic functionality behind third-party JS addons that break every update and when you complain they tell you you shouldn't need them... Also has much more sane defaults and immense customizability out of the box, through settings. None of that nonsense where you have to hope that you'll find some obscure gconf option that will solve your problem.