I started and stopped reading The Spec Ui framework I would say 2 or 3 times over several years before I decided to read it. I don't know why it took me so long to decide to read it. Its only 83 pages or so.
My favorite chapter was chapter 5 about Layout construction. I think I understand layout construction better after having read chapter 5.
I still have not made a project with spec after I read the book. So maybe I need to make a project. I have always wanted to make a program with a gui. For that matter I have always wanted to make a program. I can't make a program by wishing to make a program. I have got to put fingers to keyboard and start coding. Hopefully I will.