What I very much like is the workflow. From writing on cards on the right side, to putting cards into a list of articles on the left side.
An application that goes beyond traditional writing tools, with unconventional functional design, excellent interface design and layout, and advanced aesthetics. And having my favorite drag-and-drop card library makes writing a lot of fun.
The development looks very good. In addition, developers respond quickly to feedback.
I actually really enjoyed using this to organize a long document. It is a wonderful idea and unlike anything else i've seen.