Pros
The work was very rewarding and many of the team members were great to work with--very supportive and most clearly care about the mission. I built up a lot of great skills and worked on fascinating projects. The benefits are quite good (despite the salaries being quite low compared to market averages).
Cons
After a few years there it became clear that their management structures and appraisal system is pretty broken. There's no clear system to promotions and there are clear favorites of upper management. Some of the managers are extremely toxic and have essentially forced several people to quit through bullying tactics. There is a general lack of support for analysts / lower level managers when it comes to burnout and acknowledging effort / expertise, despite the company paying lip service to things like mental health support. e.g., they'll give you burnout leave if you raise the issue but you'll be punished for "poor performance" when you return. It's not a sustainable place to work for more than a few years, especially given the severely low salaries and no cost of living increases.