Elastic Web-Scale computing– you can increase or decrease capacity within
minutes not hours and commission one to thousands of instances simultaneously
Inexpensive – Amazon passes on the financial benefits of scale by charging
very low rates and on a capacity consumed basis
Amazon EC2 does not provide any control of the hypervisor or underlying hardware
infrastructure
Amazon does not offer fault tolerance for EC2, you need to design this into your application
stack (and assume things will fail)
AWS provide an SLA for EC2 that states that services will be available within each AWS
region with a Monthly Uptime Percentage of at least 99.99%