I haven't read this one - but I have read some of Kenton's other works. If anything, you can always revisit a book later and glean more from it.
I just recently got gifted a copy of Pure Effect and having read it before, I found a lot more information that was relative to my current interests this time around. I've read someone else's copy before but it was too early in my studies to really appreciate the points.
The same goes for Expert at the Card Table - Dai Vernon, I believe, said that no book would benefit the student more through constant study, and less through a single reading.
The HP Lovecraft of Bizarre Magic