As an owner of the book/iPad app, did you own it before or after the permit class? ______
Then, a. If you purchased it PRIOR to your class, was there something particularly helpful about it, as a pre-class reading? --OR-- b. If you purchased it IN OR AFTER your class, have you reviewed it often or found particular things interesting to you after class?
I purchased the book (and Joel's book too) and read it cover to cover in order to help me decide if I wanted to carry. Once I made the decision, I re-read sections to make sure I had a good handle on the material. I felt very well prepared when I did take my class. There was nothing presented in the class which conflicted with what I had learned from the book (or on the forums), so I felt confident that I understood the material fairly well.
To me, it just makes sense to read the book and then have a chance to review and discuss with an instructor just as you'd do for any other course.