Pros
People are here for the good of other people. Namely, customers, partners, other amazonians, and the humankind as a whole. But this is not being done in a top-down fashion. This is the culture. And you feel the difference from the first day - being obsessed by "How can I do somebody's life better today?" is just a normal behavior, and it's very sticky. Since I read "Monday starts on Saturday" by Strugatski brothers in my teenage years, I dreamed of joining a community, such as described in this book. The community of truly interested, talented and true people, who do things the way they should be, even if most of the world doesn't know they even exist. From what I see, I've got really close to that dream here.
Cons
Open positions are closed so fast that you're need to be really lucky to get in the right time in the right place. My advice - find a person you know or somebody who can introduce you to an amazonian, and ask to refer you for an open position. Unlikely this will raise your chances to get hired, but you can save time on waiting for a reply on your blind application via the amazon.jobs website.