Pros
Everything about this company is fantastic. The people are intelligent, fun and kind. There is no egos, there is no attitude. There is no boss-from-hell. Everyone is here to get the job done and make the world a better place because of it (and have fun doing it!). The perks are also awesome, including free breakfast and lunch (from 3 on-site chefs). A free top-end laptop when you start. Free gym membership. Conference allowance. We also went on a 2 week company retreat to El Nido! If you're an engineer like myself, you're going to be surrounded by some of the smartest people you'll ever meet. It's likely that anything you previously thought you were an expert at, someone here knows it better than you, and if not, you're probably worth hiring. Working here is seriously amazing, and if you're looking for a challenge with a fantastic work environment, I'd certainly recommend it.
Cons
The skill-level of others is actually quite intimidating, especially if you have just started and aren't sure what you're doing yet. The codebase is very large and many simple tasks are actually non-trivial due to the fact that you'll be serving millions of users and your code needs to be polished and scalable before a release. Be prepared to learn a lot (even if you think you already know a lot), and if that doesn't sound like a challenge you're interested in, you almost certainly wouldn't want to be working here.