Pros
You may have the opportunity to rub elbows with celebrities or visit Hyannis Port, and you get to say you work for the Kennedys. That looses its appeal after a while. Management has big ideas and aims to help people, but their success is questionable
Cons
Despite good intentions, there are often no real plans on how to accomplish goals (no theory of change) or whether goals are really feasible. There isn't really a central mission to the organization and the diversity of programs they have really reflect their tendency to chase money (private money, not grants) instead of being strategic. Junior staff are not supported and there is little hope for advancement. Most staff are unhappy. I know online reviews are hard to judge for their honesty, but I'll say this, if you are considering a position, ask them how many people have resigned in the past year. There tends to be a mass exodus about every 2 years.