This book is good for the most part. I did enjoy it and found it useful for certain populations, although I also have some concerns. The training advice isn't bad, but I have to agree with some of the other reviewers that it seems to be geared toward beginners or women who aren't "hard-core" fitness enthusiasts. I emphasize that the worthwhileness of this book depends on the exerciser's personal fitness goals. If you're looking for general health and fitness with some moderate shaping benefits, then go for it. As an NSCA Certified Strength and Conditioning Specialist, I wouldn't personally use or recommend most of these exercises with my athletes or clients, except for squats, lunges and deadlifts (which can benefit anyone); then again, our goals are entirely different.
My main concern is the diet portion of the book. The advice is sound, but the actual diet that Reno prescribes is atrocious. First the positive stuff: the food choices are good, six meals a day is good (keeps your metabolism revved), and the macronutrient ratio is good. Now for the negative: the calories are WAY too high for each meal and hence for each overall day. Day 2, for example, will provide approximately 2300 or more calories (other days aren't as bad). Unless you're an elite endurance athlete, you'll probably GAIN fat weight on this diet - not the kind of rounded butt most people are looking for. I also wonder where she gets her nutrient info from, because some of the stats given can't be right. Case in point: Oatmeal pancakes on p.97. She writes that it has 600 calories per serving (which is a huge amount for most women to eat for breakfast), but the entire recipe has about 680 calories, and the serving size isn't noted. To make the diet more suitable to most people's needs, I'd recommend cutting in half the portions of meals 2,4 and 6 (which are probably supposed to be snacks).
Don't be fooled for an instant that the butts of the fitness models in the book are at all representative of the kind of butt the average woman will derive from Reno's advice. Remember that these women have exceptional genetics: that is why they are elite fitness and bodybuilding athletes. Plus I wouldn't doubt that some of them are juicers. I'd also bet the farm that none of them used the kind of soft-core program that Reno outlines. At any rate, normal women with normal genetics and a normal lifestyle (ie. diet/exercise habits) is quite unlikely to build a body-builder Bertha butt.
Everyone is different (that's why we're called "individuals!"), so you really just have to find your own path. As I said, it's good if your goals are fairly modest, but watch the diet.