Impossible to tell how well it "holds up to" other, licensed ATF+4 certified fluids. Generally speaking, I've had a good experience running Schaeffer's products and I'd bet that their All-Trans Supreme wouldn't be any different. That said, I'm not going to recommend that you run something other than a certified fluid in your transmission, especially with a spec that's widely available on the aftermarket. Here
is a great list of all ATFs holding the ATF+4 spec. Looks like there's 41 fluids to choose from, so pick your favorite brand, label color, or whatever you'd like and run with it.