This book is basically about modifying watches (for example, replacing dials and hands), and building watches from components (whole cases, movements, dials, and hands). Since the former is what I want to do, the book was a good choice. There's a lot of information in here, put together all in one place. One _could_ find this information by searching Internet watch forums, but it's all been collected here in one place. That's the good.
The bad? The book needs an editor. It is full of spelling and grammatical errors, as well as poorly written awkward sentences. The book also jumps all over the place, often changing the subject mid-paragraph. My high school English teacher would have given me a "C" for this book.
The graphics arts teacher (if I'd had one) would have flunked me. The layout is terrible. Often, a picture will appear on a page, with the caption for the next picture immediately below it. The picture to which it belongs is then on the next page.
In summary: The book contains a lot of information which _can_ be found elsewhere, but is conveniently located all in one place. However, the book is unpleasant to read due to textual errors and poor layout. 5 stars for content, 1 star for everything else, hence 3 stars overall.