I got this book/CD last year, "J.S. Bach for Electric Bass" because: 1) it sounded novel/neat; 2) my music reading skills are woefully deficient; and 3) it should help with: a) dexterity, b) finger positioning, and c) fret-board familiarity. Lazy-ass that I am, I didn't get to working on these pieces until now, and all I can say is Bach sounds like ass on electric bass. No one, but no one wants to hear Bach on electric bass. Unless Victor Wooten is playing it, and even then it's more "wow, how does he do that?!" than "Bach sounds lovely on bass".
Needless to say, going through this book will be a more technical exercise than aesthetic experience.