Take a look here:

http://www.youtube.com/watch?v=rO5PAQbxpJ4

I guess the answer is not very fast.

I would imagine the roll rate would be even slower with the big tip tanks on.

If you want to do radical 3D type aeros this is probably not your machine.

But if you want to do beautiful, smooth, elegant aerobatics ......................

Have to admit though, the climbing spin with the smoke on is very impressive for a jet aircraft! - John.