This is not a "commentary" at all, but a collection of all the footnotes from MacArthur's study Bible. It would be useful if you did not have that study Bible, but not if you did - and I do. I wanted a real commentary. I have given this book away.
I love the many insights John MacArthur has, but because his teaching style is to go verse-by-verse, the end result is a little choppy to read. The MacArthur handbook is a useful compliment because it gives book-by-book overviews. I would recommend buying both. If you're looking for a commentary that goes section-by-section, I recommend Bible Knowledge, Expositor's, or Williams' Complete Bible Commentary.