I like that it's easy to configure, has great documentation with examples for each step of configuration process (and even more if you need).
It is flexible enough so we can customize what permissions do different users have in our application without having problems when adding new features or making changes later down the line.The system itself isn't very good at handling errors which makes debugging difficult sometimes but this could be because my experience was mostly using Postman instead where there are some helpful error messages/logs etc as well. We use falliable mainly within an internal app used by several departments across multiple locations - allowing them access only certain areas depending their role would help us keep things secure while still giving people useful tools they require daily!