Pros
If you are on the right team, you don't mind coming to work. It really depends where in Amazon you are and who you report to. Moving to different roles within Amazon is not only supported, but encouraged. Although you can stay in your role for a few years if you like it, you have the option to move after a year if you don't and internal hires are generally put ahead. Internal networking is encouraged (during work hours) which really sets everyone up for success. Nice campus. Plenty of businesses within walking distance (restaurants/lounges, workout studios, coffee, whole foods, drugstore).
Cons
Lots of meetings, which make it difficult to get work done at times. Commuting out of the area is difficult at best. Traffic congestion around campus.