Pros
Creative, hardworking team is tackling a big problem with an innovative product. Team and leadership are nimble and able to respond to opportunity and customer needs quickly. The company offers team members a great deal of flexibility to work on challenges that they find interesting, in addition to their core responsibilities.
Cons
As a start up, hours are long. It can be easy to struggle with a healthy work-life balance. This is pretty normal for all startups so you need to know what you're looking for before considering the possibility of joining any startup company.