Compared to the heavywieghts for just a few more dollars this is struggling. Maybe in a year or two it might be a baby Scrivener ($45) or Storyist ($59) or StoryMill ($50) or Jers Novel Writer ($30) or even the tired old Ulysses ($12).
My point is that this is a nappy-wearing baby in a crowded market of top writing apps that have graduated over time to be olympic level performers for writers. I just can't see why anyone would spend $40 on this awkward app - you can't even delete chapters at the moment and the index cards don't reflect the chapters. Still it is bare and that can be an advantage - but there is nothing here that is not equally or better done by the others - particurly Scrivener - which is now partnered with Scapple, a beautiful, free form whiteboard of a writer's mind space.