Great software. As you can see by my usage time I rely on it quite heavily, but I am not a designer or writer - I am software developer and I use it from that perspective. This is a software based on a very simple concept - to represent data in visual form. This can be skills tree, game story, location guidelines for artists, assortment of relations between narrative, everything. Game design and story design is major scope of this tool, but I use it in quite different manner:
1)It is good milestones organizer. You have development plan? Make it in Flow while attaching some guidelines for team. Make screenshots of each step to display. Nice and clean. Much better than generic issue tracking solutions as those don't track relations and have no associations. I wonder how this can be optimized by using multi-user version.
2)Need to understand your client? Easy enough - give him articy:draft and he will express his desires in neat standartized form using flow, location editor or even feature editor if he needs interface(that way client can properly describe data relations).
3)Writing short story? Well... Actually it is designed for it. Contains everything you will ever need especially with new document editor with links'n'stuff.
4)Designers don't want to touch you monstrous tools and abstractions? Well, articy:draft supports xml export out of the box. If you are coding in C# you will just make an export job into easy task with LINQ to parse data and get out safely without angering designers inner demons.
Problems: most of the problems reside in the version 1. Version 2 seems to be more performant with large amount of stuff on screen and doesn't freak out when multiple articy windows are opened(which annoyed me like hell before), but presentation tools are, well, "boring". There is no indication of dynamic and user responce. It is much easier to traverse flow using manual control in its editor instead. That way it will present relations and references with ability to go check those on demand while presenting. That is the only uncomfortable part of articy for me.
Recommended for every type of developer and any case.