definitely a lot of good information, and a book worth having to refer back to over and over. that said i found his attitude really annoying. i think if you have a platform like a book it's fine to use it to highlight your opinion, and to put forward your theory on parenting (attachment in this case). what bothered me was how often he'd say things like, "do what feels right to you" or "this won't work for everyone" and then gave advice that only took into account his parenting strategy. he totally acknowledges that not everyone will do attachment parenting, or not all aspects all the time, and then berates them for it in a subtle way. two men (or one man) parenting are going to find it extremely difficult (or cost prohibitive) to give breast milk, so allow for other options without the guilt trip (since you say that's what you're doing).
