I am still enjoying Gnome 3. However, issues ( I think with my ATI driver) on my home machine have led me to upgrade to Ubuntu 12.04 (alpha!). This has gone very well, and seems very reliable - I hpe it stays that way.
I am making use of Gnome extensions anfd have found several useful ones - even though they are to put back some Gnome 2 items (like trash cans window bar)
One thing that I am missing is having the "hot corner" duplicated on a second screen. In fact i would like the top bas also duplicated on the 2nd screen! Any pointers welcomed.