Okay, let's get it out of the way: this is not a 'workshop manual' in the style of the traditional Haynes car manuals. It's full of colour artwork, background info and technical descriptions of what's inside each Enterprise and how certain things work (such as impulse engines, warp engines and transporters). Also, and perhaps rather obviously, it is not based on a complete strip down and rebuild like the Haynes car manuals, and it is absolutely fair to say that the level of technical detail does not match, for example, the Star Trek: TNG Technical Manual (Okuda/Sternbach). However, that book is over twenty years old, is black and white throughout and covers just the Enterprise D. The Haynes Enterprise Manual covers ALL the Enterprises (apart from the one in the new film, but I can sort of see why this would have been difficult), so it's bound to look light in comparison. I've read the previous Star Trek technical manuals, and they are pretty heavy going. Fine if that's what you want. But if you want something that's much easier to read, and MUCH better illustrated (full colour elevations plus cutaways of every Enterprise) then give this one a try. In short, it's not over technical and therefore may appear a bit 'lightweight' to the real trekkies out there, but for a good overview covering all the Enterprises in one book, it does the job. It is what it is, and even if that's not what you were expecting, it's still the first Star Trek 'technical' book in a very long time.