Faster and with Management
We have used another company on AWS MP before, but decided to go with these guys because the EC2 was designed for speed. Redmine can load a little slow if not optimized. 
Although not the latest versions, we decided it was a good place to start.  We are also using aMiSTACX for our WordPress, so we figured let's give it a go to stay with the same MP vendor. 
Pros
* Faster than our B*tnam* EC2 [Apples to Apples]
* You get monitoring with their Area 51
* Great support!
Cons
* Not the latest and greatest version of Redmine. 
* Not free like B*tnam*
                    
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