Pros
The org is filled with extremely smart people, which is always a plus. For a post-series A startup they have more than what you would imagine. An actual 401k with a match, benefits, and a commission plan that is extremely well hedged to make real money long before the equity comes into play. The CEO is an engineering genius (and that isn't gladhanding), they are normally hard to sell for. However this CEO understands sales and salespeople. He sells as well. When you have a great tech and a wide open market you just need the right people and the right plan.
Cons
Startup life isn't for everyone, and while many people move with urgency not everyone does. Some people hide behind a lack of visibility. Those that want to make money know what stage they are at, and the hours can be long. Work life balance is good on the day to day though.