IMO, Super Tech is probably fine to use, especially the licensed fluids. If it says Mercon V or whatever, it has to meet that spec. I'm sure even the universal fluid is fine.
I don't use ST in my transmission because the truck gets regular flushes with BG full synthetic. I do use ST Mercon V for turkey baster changes on the PS pump though. With almost 92K miles, my PS works perfectly. I don't even have the notorious Ford whine. I was thinking of switching to a full syn for the PS since I have switched every other fluid, but I'm sticking to ST for now...anything that prevents Ford whine is a winner.