Pros
Every one of my co-workers loves the product we're building. I was skeptical but after using it myself have come to feel the same way. My team gives me the freedom to innovate, with enough direction to see where my ideas improve the product. Toxic people are not tolerated - thus the workplace is synergistic, with differences in opinion tended to so that the best solutions can be achieved. You also won't be barred from moving into a new career path if that is what you want - they intend to keep good people as long as possible. Transparency is valued and this has been demonstrated to me on multiple occasions. We have Ask me Anything sessions with the CEO down to middle management, where plenty of hard questions are asked and answered. You don't have to go through your direct report to talk to the VP of Engineering three levels up either. Despite the possibility that these values don't always hold true, I believe there is a group of very good people at the top of this company, and eventually the values flow down and permeate the organization. Anyone can join a management at a company and start making that department go to hell, but if there are good people at the top, eventually that gets fixed.
Cons
Though my team has been fantastic when it comes to freedom to innovate and cooperation, I'm sure there are teams who don't have that. The company has started to grow extremely fast, and sometimes the best decisions aren't made out of a need to make them quickly; that's the nature of the growing beast.