I think it is a very good option if you don't like Gnome 3 but want to benefit from all the new stuff (ie. GTK+ 3) with a more traditional desktop interface.
I've just upgraded this machine and lasted about three hours before I couldn't take Unity any more. Cinnamon is a really nice lightweight alternative which still makes a nice and (to me) sensible distinction between applications and instances of them.
I think it is a very good option if you don't like Gnome 3 but want to benefit from all the new stuff (ie. GTK+ 3) with a more traditional desktop interface.