The coolest part is that you can adjust the "heel in" and "heel out". This solves 2 problems.
Ever have the inside of the heel of your shoes clip your chain stay and have to consciously (until you subconsciously start to) hold them away from it? Turn the heel in screw and your heel will not be allowed to to touch the chain stay.
Do you have sloppy sprint or climbing form and sometimes accidentally twist your foot too far outward and disengage? You can adjust the heel out further than you can twist while on the bike to where only a "pigeon-toed" twist can get you out.