[knoxos]

I'm using S3, EC2 for mostly all test-servers, and some EC2 instances also for production modus (resources were allocated when we need them). But as already mentioned, you have to be aware of the costs - so, I combine AWS with dedicated hosted servers also, because it is still cheaper yet. The best things within AWS-Services are from my point, that you save CAPEX for your own infrastructure and you're more flexible in scaling (if your architecture supports that). But keep in mind that AWS has some "hidden" costs you should be aware about (charge for requests, own IP-addresses etc..)