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Title: Shockingly bad
Review: This is the kind of ambitious undertaking that should have been done by someone with deep expertise in the field and *then* checked by specialists in each of the dialects, or written by a team of experts. Unfortunately, it seems to have been written by one person and then not checked by anyone. It's full of bizarre claims and errors; if you speak or specialize in one of the dialects of English that is not shared by the author, you're sure to find a host of linguistic (and sociolinguistic) errors and errors of omission. That is, he states things that just aren't true, and he doesn't mention critical information. Look for another book on the topic--don't get this one.
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