Pros
the employee culture are filled with forward thinkers, funny, thoughtful, and put teamwork first and furthermost. easily the kind of people you want to work on a hard project with, but also grab a beer on a saturday.
Cons
start ups are exciting that you are developing your own rules, solving problems for the first time, and creating magic from the ground up - with that comes natural growing pains of handling a little more than your "job title" and being flexible as the company does not have all the answers yet.