They should call this Ultimate Destruction's expansion pack, since it is about just that, but without the next-gen bugs.
I have never had any framerate or clipping problems, but the game did crash on me once. I was trying to view the map during a mission after extended play. I am guessing it was becasue of the playtime, but who really knows.
If you have played Ultimate Destruction, than you know what to do here. The only major difference I ahve noticed is that all buildings are destructable. Besides location and the subway system, nothing really major.
I recommend sticking to Ultimate Destruction, unless you decide you want to bring down the U.N. building. If you don't have or never played Ultimate Destruction, this one is a good alternative since it is readily availiable.