The ability of this platform to be able to run multiple cloud environments in one instance makes it very useful when you need more than just 1 type of environment.
Also being open source allows us access to all parts that make up our system which has been beneficial as well since we are not limited by their support services or licensing costs. I do wish there was better documentation available but once again its still pretty good overall especially if your familiar with linux servers already. We needed something where we could have different types of clouds running at the same time without having too many separate instances so using mirantis allowed me to create what i wanted fairly quickly.