Pros
They have good benefits on day one including matching your 401k up to 2%. They also have allot of room for growth(if you can figure out how to apply for a promotion). They also offer you college tuition and/or certification classes to help you leave Amazon. They offer you money to leave Amazon based on the number of peaks you have worked. After the first peak you are offered 1,000 and then an additional 1,000 for each peak you work. They generally only give you a one week window to take the offer and if you do take the offer you agree to never work at Amazon again.
Cons
If you work hard you will be rewarded with the expectation that you continue to work just as hard if not harder. You have to understand that the people that work hard are the people who keep the rates of the team high. If you want a promotion don't work to hard and apply for a promotion. If you can interview well you will get a promotion. At which point your level of work will be even less.