Pros
There are tons of things I like about working here – the work environment is great, and really conducive to both individual work and collaboration; the culture is a perfect combination of all the things I think make people creative, productive, and happy; the people are both amazingly gifted and incredibly open and laid-back – however the best thing is that they're not afraid to dream big, and come across with goals some might consider "lofty". Our purpose is to "create a sense of belonging". I just find that really compelling. From lots of other companies that would seem kind of "pie-in-the-sky"-like, but here, it feels incredibly genuine and gives meaning to all the smaller tasks that make up our work here.
Cons
Most of the "pros" could also be considered "cons" if you can't adapt properly. For example, the open, collaboration-inducing floor-plan could be distracting for some (I bought a good set of earphones and don't even think about it anymore). The fact that our company is young and growing quickly provides a huge opportunity for someone with initiative looking for personal growth – however there's not (yet) much in the way of organized career planning. (I just let my manager know this was something that was important to me, and I've found an amazing amount of support with things like training time, extra-curricular projects, and time to attend local events that pertain to what I want to grow into.)