Pros
It's a high achieving place and you're often surrounded by intelligent people. You're encouraged to think differently and take calculated risks - 'can't do it ' is not an option, there's always a solution, I like that philosophy. There's plenty of opportunity to progress fast if you show the right skills, mettle & attitude. You have full ownership of projects which is simulaneously liberating and frightening if you're used to working with people who micro-manage (as I have been previously. It's a very successful business.
Cons
It is quite a serious and tough environment compared to many I've been in - I mean tough in the way that it's constant pushing yourself and your boundaries and the way you approach things. You are left to take the initiative & make your mark yourself - there is no real hand holding and 'slowly slowly' approach which can be a bit daunting at first. It's extremely busy and fast paced, my interpretation of 'fast' changed dramatically here.