Mack wrote an answer about K2 Auto Ever Snowboard Binding on April 27, 2009
they are very stiff bindings. they seem lighter than most bindings. but the stiffness might be a problem with the rails. I don't really know as I'm just starting to learn park. but these handle any freeride terrain I threw at it. Very responsive, very damp. I would like them more if they weren't auto ratchets tho, oddly enough.