Options and simplicity of design have never been so well presented. A book that would easily be worth a price for free that contains literally (not figuratively) dozens of classes. Races for whatever your style is (two types of goblins, kenku, and psychotropic frogs), steam powered armor, and rules to give you whatever kind of game you prefer. It would truly be a mistake to not give this a read.
[5 of 5 Stars!]