Pros
Working with some of the most eclectic people as well as eccentric. Never a dull day at the data center. If you are a data center professional looking to up your game because you like the IaaS game, you cant go wrong working with one of the flagships of this relatively new industry. If you are in a less established region, you have a lot more freedom to go buckwild and devour information/work/experiences. If you put in the work, (pre corona) expect chartered (and of course, company covered) trips to multiple dcs globally. I have left AWS since to pursue other opportunities, but I cannot lie, this company takes their Day1 ideal seriously.
Cons
Top heavy, shifting management. Promotions can be a bit of a crapshoot, with people getting promoted for spearheading things that have little to no impact on your actual job. I was at Amazon for 2 years and 11 months. My manager changed 7 times (including SKIP). The location I was working was NOT a high volume site.