StoryMill Software from Mariner, Worth it?

The StoryMill software from Mariner caught my eye when reading a post from Mac.Appstorm about a bundle sale of mac software (including this software). Anyway, I downloaded the free trial and it's got a lot of cool features to help keep you organized, but I'm wondering if I'm just overwhelmed by the newness of it, but in a week or two I'll realize I really don't need it and it was a waste of money.

Anyway, I was wondering if anyone has used this software before. Did you like it? Is it worth it?

Thanks, I'll test them both and see which one I like best.