I've got a buddy in the paint/body supply business. He sold my son a gallon of filler simply called "Gold" (Pro Line Performance Products) and was told it's the exact same product as Evercoat Rage Gold but at a much lower price than the Evercoat label. Just compared a can of each and the ingredients (and numbers) and packaged weight are identical.

The Evercoat fillers are "lighter" and easier to sand than Bondo. Primarily poly resin and styrene (+talc and other ingedients).