Updated:
I'm leaving my original review below because i think by leaving it, along with the resolution helps highlight DriveThru's great service. After leaving my original review, I opened a ticket with DriveThru and provided a picture of the binding on the copy I had received. They responded within an hour, and with no questions asked, indicated that they would send a replacement. I just received the replacement, and the quality of the binding is much better, it's nice and tight without any gaps or looseness. I'm much happier with this copy. Still a tiny bit steep for a book, but I've really wanted this one for a while.

Original review: I had this on my wishlist for a long time before finally buying it because, let's be honest, $79.99 is really expensive for a book. But I liked what I saw in the free version, and I really prefer physical books to electronic versions. But I am really disappointed in the binding job. I'm torn about leaving a bad review. The game and the book's content both merit a 5-star review. However, the binding job on this book I'd consider subpar for a $29.99 book, let alone $79.99. I've ordered a handful or so print on demand books from DriveThru and from LuLu, and I feel I've been happy with most of those. But this was really bad. I doubt the binding is going to hold up for a single read through, let alone the wear and tear from travelling and use during gaming sessions.

If you're contemplating this, and you're buying the PDF, go for it. It's a terrific game, and the content and layout is superb. But I'd strongly advise steering clear of the $79.99 version.