Trent's writing is rudimentary at best and he uses crayons to illustrate his movements, and the fact its in a duo tang is a little surprising, but it's his pursuit of purely anecdotal research results that sets it apart. A completely subjective view of pec training was a fresh outlook when so many people want to overuse old school, data driven, academic research hocus-pocus.
His focus, like I mentioned is to separate all the fibres of the pectoral region. He's developed a system called "angled targeting" which he discusses in the second paragraph to target these fibres. Hitting each with its own movement. There's an extensive list. He's even tabbed his book using coloured binder separators to identify each section of the pec. UPPER, DOWNER, OUTER, INNER. Kind of cool that he uses downer and not lower. He's pretty unique like that.
He often refers to "axillary protracting," which is just a fancy name for sticking this contraption under your armpit to help with angling. I gave in and bought his device, but you can easily make one using a spring hinge, a large wooden elementary school protractor and a couple of hockey sticks.
He forgoes contemporary rep and set application and advocates for lots of volume under maximal loads. you often need spotters, which can be a limitation to some, but he gave us this super slick tip to attract peoples' attention in the gym. I won't give anything away but it has people running to you in no time. HINT: He loves a certain movie about a certain man raised by a certain kind of ancient human relative...
MoM, I have the PDF version if you want it. And I can send the blueprints for the axillary protractor to your zip drive, if you want.