I bought it direct from Frog God Games and while I'm by no means an old school DM, having only been running games (Pathfinder mostly once Pathfinder came out, 2e and 3.5e D&D mostly prior to that) about 8 years now, I do enjoy the older editions and have a decent amount of DMing experience. I found a lot of very useful and fun tricks I had never considered or heard of before, along with some tricks that I did know about but which were presented in a better way than I had considered it. I can't imagine anyone knowing every single trick in here well.
I don't want to go into details on anything included, since as the book mentions thatif these tricks are known by all the players in a given game some of them lose their effectiveness. In general though the book has some house rules used by Bill Webb in his game, tricks that make encounters more interesting using all kinds of situational dangers, various misdirections, fun and adventure spurring ways to separate adventurers from their money, and other fun tricks. The tricks, paraphrasing from the author's own words, are intended to create great players and a great campaign where even the mundane can't be taken for granted and boredom is rare.
I don't know your gaming history, so I don't know how much of this book you may know already, but I'm confident that you'll find at least a few thing in here you haven't seen before, and others presented in a way you haven't considered. The pdf is 82 pages, including the front and back cover, 2 pages for the table of contents and title page, and 2 pages for the legal appendix, so 76 pages of actual content. There is a 5 page introduction and book overview section, with some good information on the intent of the book and a short bit about each of the book's other sections. There are 8 of these sections, and I think I'll hold off on naming each section for now to make sure these guys want it known. One section is devoted to Bill's Lost Lands house rules, all the other sections include a number of tricks based around a certain theme.
In the end, I think this book was a steal at the pdf price. As a DM I immediately saw a handful of tricks I plan to use in my current games to give my players an interesting and fun time, and others I plan to hold onto in case we get into a rut and the game needs a shot in the arm. I can see myself recommending this book to everyone I know who DMs (except my current players perhaps).