It's full of information that I'm sure I'll be referring to in the future, so I'd say it's good to read it once and then keep it around for reference. A great value!This book is worth buying. Xlint book. I was very impressed on how well written it was. It was intelligent, concise and full of very usefull information. I was glued to every page! Although no book can hold your had from start to finish on your specific project, this one gives you the background and confidence to do it yourself. Even the paper used is of a high quility, glossy type... ahhh, the little details :) I would however stay away from: "Building & Tuning High-Performance Electronic Fuel Injection" by Ben Strader. In short, it sucked! The only real value I got out of that book was under the one short leg of my coffee table. It was of almost ZERO value.