I like that Cascade allows users to save multiple drafts of web content and that it can also send those drafts for review. It also allows users to be notified of content changes on different levels.

Very customizable and powerful once you learn and understand the underlying data structures. Comprehensive REST API that allows for interaction with the CMS using whatever method you typically would. They're always adding new features, and actively soliciting feedback about how to make it better.

It's a well-organized platform that's easy to use and train people on/in.