Join if you have been offered a position at the appropriate level or you will be stuck.
Pros
Great to have a large company name on your resume. You can work on as many services/projects your want and interact with all sorts of folks. If you want to work 24x7 you can surely find work to do and even do work not related to your primary job to help develop new skills, If in a pre sales role, you literally can travel anywhere and travel very comfortably.
Cons
Golden handcuffs for RSU's and 401k match, each time you change roles you "reset" the clock to be eligible for a leveling promotion, not everyone at AWS is actually smart as there are a few deadweight folks who for some reason are still around and they literally don't do the work that is expected at their level, lots of politics between service teams, public sector teams don't get the same attention as commercial teams, level process in general is odd, especially if you have a manager who is an amateur, and doesn't understand the promo cycle process, they can't appropriately advocate for you. New folks get hired in with hardly any relevant experience to the role they are hired for, but will be hired a level higher than most tenured folks, your future lies in the hands of your manager, if they suck, you are screwed. Management will play games to keep you from leaving, but won't do their part. Easy to get caught up in working 24x7 while sacrificing family life or work life balance.
