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Instance type should be configurable #7
It's also important to note that Micro instances are intended for "bursty" activity and will be limited in non-specific ways by Amazon. Since many load-test tools (like ab) use lots of CPU, this can prevent getting accurate load testing results.
Read more here (lots of graphs that demonstrate the throttling behavior): http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/concepts_micro_instances.html
So personally I'd want to be able to spin up Small or even Large instances for testing.