Pros
Under Armour is a young, fast paced, team oriented company, where hard work is expected, but also well rewarded. One of our most impactful mantras is to think like an entrepreneur. This gives everyone from top to bottom, the opportunity (and responsibility) to make the company better! This can come in many forms, but speaking from my own experience, I've been allowed to build a team from scratch and define it's structure in, what I believe to be, an innovative way. In my 16+ years of corporate work, I can confidently say that I've never seen a culture quite like ours!
Cons
Like any young company where things are still being defined, structure and process can be a bit lacking. But those with the drive will find that this is actually a plus, as it gives plenty of opportunity for ownership and the ability to define ones own future.