Pros: The employees. Genuinely nice, smart, caring people who care about and work for each other. The employees are very encouraging and like to promote and learn from their teammates. It's definitely easy to see how your individual role contributes to the whole of the organization. Because it's a small team, you really get to feel the impact that each department has on your success. There is a lot to do and lots of encouragement to take on projects or fix efficiencies that will make you more successful. If you like taking initiative, you will do well here.
Cons: While you won't be working 12 hour days, growing a company is not a 9-5 so if your heart isn't in it, then everything will seem exhausting. It is easy to feel like you're working too much or too hard if you don't prioritize where to spend your time.