Pros
Great mission and product with a real chance to make a difference. Founders truly care about and cherish culture and the people working for them.
Cons
Culture does not propagate much past founders. Promotions and raises are time based now, not merit, completely inappropriate for a fast growing company. HR and Finance policies feel like a ten thousand person company not a fast moving startup. Flexibility is required of employees and change is constant, which would be fine if the same flexibility went both ways. Employees get little flexibility and very long hours. Several departments are constantly under staffed and yet they still expect perfection and threaten to fire people if mistakes are made, totally in contrast to promised culture. There is no understanding of what is being asked vs staff available. Promise of learning and development is a joke. Your manager will never accept their part in a mistake. You are expected to suck it up and "own it" no matter what.