I've been using Ywriter for a while now, and have been using it for everything EXCEPT my writing. I store my characters and chapter notes and scenes there, but I still have my long form novel in one giant google doc. I just like the view of the Google doc editing window; I can't get used to the editing view in ywriter.
The other complaint I have is that there's no 'worldbuilding' tools in ywriter; there's really no place to put information about world rules/laws/government/religion/etc. All I can do is make a fake chapter at the end and dump my notes in there, but it's just an info pile, nothing more.