Pros
GA hires very well - not only will you feel challenged by your colleagues to learn and continue to get better, but the majority of them will be people you actually want to be around both at work and at happy hour. The brand is well respected in the tech community, so you'll certainly have a sense of pride while you're there, and it doesn't hurt when you're looking for a future gig. Despite ups & downs, the experience can be incredibly valuable to your professional development. You're constantly solving problems at a insane rate, and while that can be stressful, you'll be better for it in the long run.
Cons
I've never been at a company where senior leadership is more out of touch from their employees, top to bottom. They're often smug and aren't up front about their true intentions. And their reputation isn't just internal... just ask what others in the tech community think about certain leaders at GA. Poor culture = Revolving door of talent / toxic atmosphere. Because GA's leadership being disconnected from their business, there's no core culture that drive everyone at the company. Employees spend a lot of time griping, and ultimately look to move on within a year or two. After a few months being there, you can really start to feel this all around you.