The good:
This book has a fast and easy way to determine what you should be weighing. The recipes are healthy (with a caveat), and the "Active-Dynamic" warm-up sequence is great either done once through as a warm-up, or several times for an exercise session.
The bad:
This book essentially promotes taking a "bulk-forming laxative" (i.e., the glucomannan) just about every time you eat. Its primary use is as a laxative, look it up for yourself. It is added to every recipe in the book (hence the caveat), and what's more, you're encouraged to add it to food every time you are eating out as well.
The book goes to great lengths telling you how much liquid the glucomannan absorbs and how it can make your portion sizes seem bigger because it expands up to 100 times its own water weight (as in, sit back and watch your food expand). You'd be much better off eating the recipes without it, or adding a healthful source of fiber such as flaxseed occasionally, instead. Slow down when eating, If you're not hungry, don't eat. If you think you're hungry, drink some water first.
Bottom line: the recipes, diet, and workout are fine--ignore the glucomannan part.