Pros
Strong mission and some great employees at the 'worker' level. Have grown very quickly and are continually looking for new ways to grow. Everyone wants to help and, especially as you're getting started at the company, there's a good support and encouragement - a lot of training provided early on in the commercial org, that is very structured. It's a great place to start your career to learn some good skills. It can be travel heavy, but if you don't mind that, it's a great way to learn presentation skills and time management, and line level managers are overall pretty strong.
Cons
There are some serious issues at the CXO level of management. There is very little transparency into promotion criteria - even in the commercial organization where it's supposed to be driven on clear numbers or performance. Some senior managers get promoted after 2 years, even with performance issues, while others have to wait a lot longer for no obvious reasons. It's clear that the CXO's pick their 'favorites' and if you aren't one, you are put on the back burner. From the sidelines, there is also a major problem with diversity. It seems as though if you are a person of color, you are put into smaller roles with less visibility and it takes you longer to rise in the ranks. As the firm split from the Advisory Board, there was a lot of initial discussion about how they can build their own culture, but it seems like the leadership hasn't really taken a new direction. The same issues are there - CXO's not letting different people grow, and allowing the same people (or the people they have personal relationships with or 'like') to have the biggest opportunities. It doesn't seem to be a good place to grow in leadership; which is a shame as they have such a strong mission.