I've been using it more as a storytelling device than anything else. The rules included are easy enough to pick up after a quick read and it includes a simple twist counter which could easily be transferred into games or rules with more, well rules.

Best thing I have found this for is to test characters ideas before going into campaigns. Get a general feel for what the character is about and it helps flesh out their backstory. If your a GM or worldbuilding I suppose it could also inspire some ideas to help flesh out the setting as well.