I went to his last show, and wasn't that impressed. If you have been into astronomy for while an keep current in the latest discoveries, there is nothing discussed that you won't already know (and I'm no scholar). That's a bold statement I know, but this is popular science he is discussing and not the depths of quantum physics.
I don't know what I was expecting but I was expecting to learn something. There where a few points that made me think, but not many.
A friend of mine wanted to go to see Michio Kaku at Town hall in Sydney (sold out now) but based on my experience at Brian Cox's event I declined.
It is good to see that someone can sell tickets at $200 a pop and sell every seat in the house, and he's talking about science. That kind of makes me smile.