The most helpful aspect is the ability to build and test the API and have it be available for future use. The documentation is very sparse and needs to be improved. It would be nice to have a better way to navigate the API. This is a great tool to use if you are looking to create an API that you can use in the future. We were able to get a quick API up and running that allowed us to start testing our data. I have used this tool for designing RESTful APIs for our mobile app. The tool provides good documentation with examples. It has very easy to use UI. It supports all major programming languages. It also has an option to test the API using the browser. There are few features that can be improved like better support for different authentication providers. If you want to create APIs then this is a great tool to use. We were able to create APIs easily without any coding knowledge.