I must admit that I have not read the book, but from what I understand, it is a ketogenic diet that then reintroduces carbs, so you eventually follow a low to moderate carbohydrate diet, correct?
Competitive bodybuilders have used ketogenic diets to get in contest shape; however, they are often used as a "last resort," basically only used if you need to drop a lot of fat fast.
Although you will drop a lot of fat fast, I don't think that they are good for a few reasons:
1) Ketogenic diets require a very delicate balance between protein, fat, and carb intake..if you eat too many carbs, you will go out of ketosis; if you eat too much protein, the protein will be converted to glucose and act like carbs, so you won't enter ketosis, either.
2) You will lose a lot of fat--but also a lot of muscle. Although there is debate over exactly how metabolically active muscle tissue is, a lot of pple think that losing muscle=drop in metabolic rate...so it will have to lower your calories drastically to keep losing weight / maintain.
3) A lot of people seem to never really adapt to ketosis. As other posters have mentioned, pple on keto diets are often tired and grouchy. However, I will admit that I have seen studies in which pple have adapted to very low carb diets and maintained performance, but there are also many more pple who never truly adapt.
4) Like others have said, if you go back to eating "normally," you will regain A LOT of fat very fast because your body is not used to using carbs as fuel...that's probably why a lot of low carb diets have you slowly reincorporate carbs.
Good way to lose a lot of fat fast, but not sustainable. Try a slow and controlled approach of gradually reducing calories over time. Much better way to go about it.