Pros
The name: working for Amazon is instantly recognizable. Amazon does amazing things for it's customers. You will definately get challenged.
Kontras
There is no employee support. Areas of the business are segregated and managed according to the personalities of the leaders for that area. Compensation is targeted differently for different groups and employees are expendable. Employee investment is minimal. Benefits suck for the price. Pay mix is so stock heavy that, even at entry individual contributor levels, you are constantly watching a stock price you cannot affect in a meaningful way, waiting for your vest dates to make major purchases and pay property taxes. It does not contribute to a feeling of ownership, it must be what prison is like, marking the days.