I was a devoted FrameMaker user until Adobe killed the Mac product. I used to have to do fairly complicated legal documents, and it was worth every penny. Plus, it was a very good word processor--you never had to leave the program to edit text. So I used it for everything I had to write.

A book like this could have been handled fairly easily in FrameMaker, but sadly Adobe has decided to position in it to be only for large enterprise shops running Windows. They're probably (rightfully) afraid it would cannabalize InDesign sales if they made it more accessible.