Vantaggi
Starting from my on-site interview and even before I started working, I felt like I was joining a family. In comparison, I currently work for a mega-corp nearby, and I felt like a cog in the machine starting from the interview. I enjoyed the projects I worked on. They were important to Amazon's business and allowed me to gain extremely valuable experience, both in terms of the types of projects and the technology I got to use. Technology is perfectly adequate to get your work done. Most people opt for the 15" MBP, and do most of their development on the laptop. The developer desktops are fairly underpowered, but most people barely use them (it's easier to just use an instance in the cloud and not bother with that desktop sitting under the desk). They upgraded the snacks in the summer of 2015, and they're quite good now. You get a nice selection of dried fruits and healthier snacks (excluding the fresh fruits, which run out quickly, the other snacks don't run out which is nice).
Svantaggi
If you are not happy with your initial RSU package, you will feel under-payed since the policies are designed to make it hard to increase your pay quickly. Ultimately, comp is a function of the profits/revenue per employee and there's a small handful of companies that can pay higher.