This product really consists of two distinct pieces, the GM Screen and the Quickstart Character Generator booklet.
The GM Screen collects useful charts and references from the Mutants & Masterminds 3e Hero’s Handbook and presents them all on three letter-sized, landscape-orientation panels. This is a product that most M&M GMs will probably want in print—I certainly have preordered a physical copy—but it also useful on-screen if you use a laptop, iPad, or similar device at the gaming table or like to carry such tables around with you for quick reference. If you happen to own something like the Savage Worlds Customizable GM Screen, you could of course print these charts from the PDF and slip them into the convenient pockets on the do-it-yourself screen.
The Quickstart Character Generator is a 48-page black-and-white booklet filled with tables that allow you to generate a balanced M&M character using random die rolls. This is supposed to save you time, I guess, but I personally don’t find it appealing for M&M.
The downloadable version of the product also includes a full-sized PDF of the illustrated side of the physical GM screen. Do-it-yourselfers will need to slice the printout three ways vertically in order to use the image for a homemade physical screen.