(constructive review)

I had to read these sentences a few times to understand what you were trying to say: "You now have the choice of three S3 storage classes (Standard, Standard – IA, and Glacier) that are designed to offer 99.999999999% (eleven nines) of durability.‎ Standard – IA has an availability SLA of 99%."

No availability is mentioned for the others, but I assume it's 100%? Perhaps a simple table could help readers to scan and visually compare the values of two properties across three service classes?