Pros
Dog friendly environment. Lots of smart, hard working co-workers. The application is loved by customers and is far superior than what exists in the market today. Fast paced, energy driven environment.
Cons
Upper management is mostly a toxic cesspool, that's to put it mildly. It's a highly political environment, instigated from the top-down riddled with favoritism. Your performance and contributions really don't matter. You'll work long hours and get things done in a week or two where at most companies it's 3 months, which you'll feel proud about only to be fired or laid off because of the continual back-stabbing and bad mouthing that comes from the top. It's a company where being popular with the C-suite is how you keep your job, not actually your knowledge or performance, except for the few in sales. At the individual contributor level folks are really supportive and helpful, as you move up the ranks many will barely give you the time of day, or scoff at you for asking for any guidance.