Pros
The things that have impressed me about the company are 1) the people and 2) the ability to learn from mistakes. I have found that everyone is kind, welcoming and all are just trying to do the right thing - there may be conflicts or differences of opinions, but everyone respects each other enough to work through it. As well, we (as a business) have not always made the right decisions, but leadership has reflected, learned, pivoted and emerged in a better place than before.
I will admit, the first few years were tough; it was hard to get our name out there, we weren't always getting the best work, we made some bad hires and lost some good people. But we got through it and now things are so much better - we have incredible talent, interesting projects and the energy is buzzing - you really feel as though you are part of growing something that's going to be great.
Cons
There are growing pains as with any small company growing quickly. There are lots of senior leaders who are great at their craft, so it can be more challenging for those at the mid-level management level to find opportunities to step up / lead and move to that next level.