I'll endorse the positive reviews. I was lent the book by the Animal Welfare Society (Australia), where we got our puppy and have followed its advice with great results for our dog, now nearly four years old.
As others have said, the writing in the book can be a little repetitive, but that's because the author is a subject expert rather than an expert writer.
I have to comment on the very negative review by "A Reader". First, it's clear they haven't read the book because they make a number of statements that don't reflect the books content. It appears they've simply decided to review it negatively for their own reasons. Statements like "not supported by scientists" and assertions about pet food companies' expenditure on research are just assertions. If you want to persuade us of your point of view, please identify yourself and support your assertions with data, references, URLs etc.
My positive review of the book is based on my own reading and experience with my dog, who's been on this diet since he was three months old. It came professionally recommended to me and vets I've spoken to agree with its content.
It's a simple fact that many vet practices get a lot of income from sales of premium commercial pet food and they have a commercial in selling them. I'm not bashing any vets for wanting to make a living (all the ones I know work extremely hard and deserve all they get). And I'm not qualified to judge the nutritional merit of these products. But I can compare their cost and convenience with the diet advocated by this book - which comes out way ahead of them. And Dr Billinghurst's logic is irrefutable - dogs have been thriving and evolving for millennia without commercial dog food.