I went from 10.10 to 12.04 and installed fallback, so I could have menus. Also my screen is 4:3 so top & bottom for panels work better for me.
I am not sure there was a working fallback with 12.10 or 13.04? As it now needs Gnome 3.8.
Just today I installed flashback into my 14.04 install and it seems to be similar, but menu items have moved all over the place. Also with 14.04 getting regular errors, but it seems to keep working.