Its a bit deep to understand at first, but once you've been on the platform for a while, its pretty straightforward. I'm going to respectfully disagree with the "smaller set than people initially assume" -- there are huge differences.

Some examples:

* DNS can be set up to round robin * auto-scaling can be built in * load balancers are available and easy to use * For companies with multiple employees various levels of access can be granted to the system via IAM roles * you can add and subtract hard drives from an instance on the fly (EBS volumes) * You can set those volumes up as RAID if you so desire. * You can easily move IP addresses from one instance to another.

These are just the ones off the top of my head as I've been off AWS for about 6 months now. This doesn't even count how well the servers play with other amazon web services, like SQS, SNS, SES and RDS (queue, notifications, email, database).

That being said, I use DO for a few small sites I host because I don't need any of the features AWS provides.