dotCloud provides a platform supporting a wide variety of services. It currently supports Node.js, Ruby, Python, Java, Perl, and Opa. Available datastores include Postgres, MongoDB, RabbitMQ, Redis, and MySQL. Documentation is fairly thorough, and instances allow not just for scaling incrementally, but also by the amount of memory per instance, and are priced accordingly. This allows for more flexible solutions, and allows users to run applications with high memory requirements, such as those not initially built with horizontal scaling in mind.
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Pros
Pro Adjust per-instance memory
Most other PaaS providers only allow for multiple, low-memory instances for horizontal scaling, but dotCloud also allows for vertical scaling and resource-heavy applications by adjusting per-instance memory availability.
Pro Quick deployment
dotCloud is usually very fast when it comes to deploying your project. The CLI tool is very good at that and deploys your build almost as soon as you push it.
Pro Thorough Documentation
The documentation is very good an explains everything in-depth.
Pro Support for various types of databases
Supports Postgres, MongoDB, RabbitMQ, Redis, and MySQL. All of these can be used without any additional pricing, no need to pay for expensive addons.
Cons
Con Poor database performance
When your databases have a very high write volume dotCloud starts having some serious problems keeping up with it. Performance drops completely and in the worst case scenario the database crashes and starts going down daily.
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