Oh, don't get me started!

It is NOT unbiased as advertised. He is very obviously pro-vax (which was disappointing). Many of his "numbers" are off, his stats were grouped strangely in some instances, poorly written/executed (and not just because I disagree with so much of it). (There are several other threads discussing this book on MDC if you search you'll find some more info),
IMO, it is a source (not necessarily a good one, but a "starter") for those families who've already decided that delaying/selective vaxxing is for them and have time to re-research his science. Otherwise, I wouldn't recommend it.