I too am a bit annoyed they threw in behind gnome, I've never been able to use it and not be instantly annoyed since it's come out. I've tried many times, I just simply don't get it. Better than Unity, but not by much, and since I've stopped deploying ubuntu 6 months ago, much happier in general.
I've been trying to use KDE for the past 3-4 years, but I finally set a fire to it mentally for it's sheer inability ever, EVER, figure out multi-monitor capabilities despite hundreds of bug reports on the same thing. Kwin compositing is still another persistent issue, combined with the inability to properly support multimonitor configs became too frustrating to fsck with anymore.
I'm back to Cinnamon on Arch, which seems to be so far my best experience with a multi-monitor desktop in years. Compsiting is a bit wonky, get some random pattern flashing every now and then that might give someone a seizure, but only in some parts of the screen, and usually in some peripheral area of my desktop that doesn't bother me much. I can however actually shut off my displays, turn them back on (effectively plug/unplug the hdmi), and have it restore my desktop almost perfectly, which KDE simply can/could never do without crashing or breaking itself in ugly ways since 4.0.
-mb