The directions on many of the projects are incomplete. For instance, they tell you to roll a spiral that's a certain number of inches in length when completed, but not how much wire it takes to make such a spiral. Through trial & error and wasting much wire, you can figure it out, but a how-to book should include all the details. And the clasps they tell you to make are ugly and weak.
The book is basically a sales pitch for their brand of wire-wrapping tools & equipment (which I do own)--if you don't already have their jig & twist-n-tool, you'll have to shell out about $25 more dollars to get them before doing any of these projects.
I found "All Wired Up" to be a far superior book: ISBN 188301073X