There is one final twist to the Formula story, one that is somewhat overlooked. Despite being the company that introduced the 4-piston brake, they decided that it wasn't a particularly good solution for providing more power, so they went back to the drawing board. They came back with these the R0s which sport an oval piston, replacing the 4-pistons. They are confident that this provides more power than 4, although the influence of the oval piston may be smaller than their previous firsts as it is a proprietary design, so you are unlikely to see it on other brakes any time soon.