I am planning a motorcycle trip to Morocco in the spring of 2010 and recently received this book. From what I've seen, it is an excellent resource for those looking for interesting routes. The suitability of each route for various types of transport (4WD, big bikes, mountain bikes) is addressed, which is very helpful.
You will need another guide book to address things to see and places to stay, this book is pretty much about the roads in between, although it does cover some sights along the way.
I will update this review once I'm back to let you know if this evaluation stands after using the book on the ground.