Pros
Amazon is an incredibly-fast moving company. My first week on the job, my boss promised me that no matter what, I would "never be bored" and 3.5 years in, that's held true. Working in the team responsible for installing new fulfillment centers (warehouses), I am given high responsibility of budgets of dozens of millions of dollars and high levels of autonomy. I have exposure to network-wide issues and have the opportunity to travel extensively domestically with occasional international assignments. The position has also been a huge learning source, and I feel like I am still learning something new every day.
Cons
The pace isn't for everyone, and specifically for my team, neither is the travel. Many people hear horror stories during "peak" - the busy holiday season - and while I've seldom been unhappy, I have worked 80/90+ hour weeks from time to time during our busy season. Again, this is the exception rather than the rule. My standard week is much more like 50-60 hours. People who are successful at Amazon also need to be flexible and adaptable - "the only constant is change," as I hear often. I can't speak to other groups or the corporate environment.