Pros
You will not be bored and you will be challenged People are as nice as they are intelligent (high bar for each) across the board from receptionist to CEO The products are innovative and valuable--ones you can be proud of Everyone is challenged to go beyond simply doing their job well--they are challenged to change the game and often do Opportunity to define your role and display initiative Unlike many startups this one is clearly on the right track with a very promising future Smart people and great company and yet the arrogance is missing. This is enormously refreshing Only the best are hired. You will work with some great people and you will demand more from yourself Beautiful office in great downtown location
Cons
Growth is explosive and staffing efforts struggle to keep up To do your job right under these circumstances you wind up putting in a lot more hours, it can be exhausting Hiring standards are very high, except when they hired the bathrooms Some problems are dealt with in too reactive a fashion