Pros
A lot of pros. Excellent no drama culture. People are genuinely there to do good work and make a difference. You are guaranteed to produce work that will make a difference, track and understand the impact of your work. A very entrepreneurial culture. Most individuals operate autonomously and have the ability to make key decisions. The team values your opinion and challenges. Executives are smart and provide valuable insights. Collaborative and cross functional. Teams generally work well together and talk to one another.
Cons
Insane timelines. Lack of prioritization. Not much work life balance. Bottom line is, there is no shortage of things to be accomplished. It is up to you to determine what can and cannot be done. They are also in a growth period and would benefit from some structured process (which they are actively working on). Sometimes it can be hard to determine who is responsible for what.