Pros
Collaboration - everyone here is pushing towards a common goal, we all want to see the company grow and become more successful. Wickedly smart people - we have some of the best people in their field but because the culture is so collaborative rarely do those smart people beat you over the head with their intellect. Speed of decision - decisions are made quickly so we can move into execution swiftly, decisions are supported by data but not to excess.
Cons
It is chaotic and shows signs of a company that has gone through some rapid growth. Things often aren't written down and there is a lot of work to do to support this growth. However that is a really exciting con to have to deal with as the company expands and brings onboard talent from other, larger companies there's a danger that the culture will get diluted.