About 24 hours of Mint 13 MATE. I have to say: This, by you, is a RC? Really? This is more stable, so far, than any final release I've tried since Mint 10. Everything installed, NVIDIA driver up and running (more than I can say for Ubuntu), and I haven't had a single problem- nothing, nada, not a one.
I went with MATE, after a lot of thought. I've tried Gnome 3 shell, Unity, and Cinnamon, and I honestly don't have a problem with any of them. I don't think G3shell is a disaster, and Unity is obviously not sinking Ubuntu, although Cinnamon is, I think, preferable to both. Nope, it's just that I think I've reached my "You kids get off my lawn" threshhold, insofar as desktops are concerned. I may change desktops in the future, probably when I get a new machine (probably a year or two away), but I prefer working in the Mint Gnome 2 environment. MATE is exactly that.
So, like I said, the RC? Might as well call it the final release, at least as far as my machine is concerned.