Pros
Athena is a great place to work if you are looking for a company that values culture. They strongly believe that culture is the driving force to a great work environment. Leadership is great. Jonathan Bush is a great leader and makes you want to work for him just to see what he'll come up with next. Athena is a fun place to work and they are always coming up with ways for staff to blow off some steam.
Cons
If you don't like "culture" type companies, then this place isn't for you. The enterprise is still young so don't be surprise if they don't have all the answers. It's also easy to get lost if you don't apply yourself; no one is going to hold your hand. Some groups are treated better than others, but I think this is slowly started to go away.