Pros
Everything from the interview process, to the onboarding, to the promotion process is thoughtful at Amazon. Amazon embraces the concept that innovation inherently means there will be failure and that is part of the process. There is a focus on creating mechanisms to scale good ideas and create an easy path to do the best thing for any given context. The people that work at Amazon are smart and capable by default (I have yet to meet an exception). Everyone is very willing to help and there are no perceptible political boundaries within the organization. There is truly a top-down laser focus on customer value and every decision is put up against that litmus test. This is truly a company that values data-driven decision making, adaptability based on new information, and truth-seeking.
Cons
The organization is very flat. This is actually a pro when it comes to empowerment of teams, but it tends to make things complex. The key to success is networking and building relationships. This isn't a con per say, but something to match up to your personality in order to determine if it's the right fit for you. Additionally, Amazon is a narrative focused company. Powerpoint presentations are of limited value, if any, and articulate writing is how you sell your ideas. Again, not a negative, but something to understand before applying.