I cleanly installed Linux Mint 13 Maya Mate 64bit on 7 June, 2012, yesterday.

I hate Unity, the default desktop of Ubuntu. So when I installed it, select the Gnome Classic desktop after installing Gnome Shell. Many people dislike Unity. So yesterday, I cleanly installed Linux Mint, a derived distribution of Ubuntu with Mate desktop forking at Gnome 2.
I feel Mate much better than Unity or Gnome Shell. It’s as easy as Gnome Classic on Gnome 3. That’s good since Gnome Classic will be obsolate.
Since I use LVM, I installed Linux Mint by the way on Mint + LVM?.