I like it and have worked more or less like this for structuring documents all my life (but manually, in text files, making trees and creating documents from those trees with a small Python script). However, I really would like this to be a desktop application; all that online stuff is not very helpful for productivity software, for me at least. I live in the mountains, I don't have internet in a lot of places. When I travel I don't have (stable) internet either.

I like stuff going to the web, but until that works fully offline after installation (so being able to make new projects, save them, change them, do everything except the stuff which really requires internet), I don't really have much use for productivity apps like this.