the sargent and corbin seats are sculpted in a way that doesn't drop you crotch-first into the tank when braking.
me? i've still got the stocker on. i'm surrounded by ball-busters so mine are like iron anyways. ha!
actually, i'm considering bringing my seat to a furniture apholsterer to get it resculpted. a local guy i know got his done for about $50 or so and digs the results.