I also used gnome-session-fallback for some time but it didn't worked well om my machine, not sure why. So I had cinnamon for some time, which was usable on ubuntu but had huccups sometimes.
My experience with gnome-session-fallback at first made me skeptical to try MATE, I glad I did, I was not disappointed. Good job, thank you for making this. Big thanks to Wimpy for making it official flavour which ensures compatibility with other ubuntus. That's I guess why I never quite warmed up to like Linux Mint, they do some things their own way and one can't never really be certain that tips on ubuntu that one finds on the web would work in Mint.