there are two differences between these bindings. the 140s have the plastic toe with upward release, and they also have a different din. if you tend to break bindings a lot go with the 180s with the metal toe, but if you plan on skiing a lot of park id go with the 140s for the upward release. if your din is 9ish then id lean towards the 140s, as the general consensus seems to be if your really close to the limits on either end of the spring they are not as consistent as if they're somewhere in the middle. some people say this isnt true but id rather be on the safe side.