SimpleTest is a new service by CloudIntelligence aimed to serve people that are not Load-Testing professionals.
If you are a Load-Testing professional, SimpleTest will bore you. We highly recommend using JMeter in the Cloud, which is a complete Load-Testing platform for the use of Load-Testing professionals.
If you are not a professional but looking for a complete turn-key solution for your Load-Testing project, including script creation, test execution and results analysis, you should use LoadIntelligence.