Better than a Chiltons or Haynes, but I still wish they could show the wiring diagrams in a routing layout according to how the wires are located in the car. The flow-chart style diagrams don't say much for where to look, or what to look for. A signal injector/tracer sure comes in handy when tracking down shorts or bad connections!
This book is stellar. It has part numbers - exploded views of what parts are in order - and how to directions to make life easier - its well put together - and worth every penny!