Pros
Most fulfilling job I've had in my 8 year tech career. Able to lead projects from scratch. I have creative freedom in my approach to feature creation as long as it fulfills the purpose management wants in the end. Small team where everyone is a 10x, perhaps the most autonomously working team I've ever worked with as well. Compensation (cash + equity) is good considering the size/funding/burn of the company. We created fair and concrete objective-based cash and equity incentives (plus growth plans) during negotiation.
Cons
I was aware of this ahead of time, but be prepared for long days and long working sessions. Management promises they will never ask someone to work more than they do and they have held true to it in my time there. Be ready to pivot frequently, not recommended for anyone that needs to stay focused heads-down during the day.