Has anyone checked out this book? It's one of the best play along books I've ever owned. There are 52 "workouts" that are very musical. Jon suggests working through 1 workout a week and after a year you'll be through the book. I'm going at my own pace and I'm currently on workout number 20. This book really hits chromatics and chord/scales for the first 20 workouts. Great range of styles and he has you playing all over the neck. There are string crossing workouts from 21-30, some slap excercises from 31-40 with the remainder reviewing concepts from earlier chapters. I highly reccomend this book.