The ability to connect with other people in my team who are using the same toolset (e.g. GIT). I like that it's easy enough for new users but has some advanced features as well. It can be difficult at times to figure out what is going wrong when you're having issues deploying your code or running tests. There isn't much support around Docker containers so this means we have a bit of learning curve every time we need something outside their base offerings. We use Cloud66 during development and deployment phases. This allows us to easily get up an running without needing dedicated resources for setup/deployment purposes.