New Challenges and Open Minds. I've been tasked with building a new team and allowed to hire the best. Willingness to innovate. This is a company filled with hyper-intelligent programmers and engineers. Sales and marketing isn't their strength, but they are quick learners and great at refining ideas.
Cons
They work hard and challenge each other. I wouldn't call it competitive - it's more like they push each other and demand a lot from everyone.