If your good you should be able to "ski" them on anything. I just find that a thinner ski allows me to ski them in a faster more traditional way. On the fatties, when I try to fly and thus sit back a little more, I'll miss a turn once in a while because the wide tails get hung up. This could be more of a function of the bumps that are out there now. Short shaped skis, snowboards and lower level skiers make most bump runs very inconsistent nowadays. On steeper bump runs the bumps seem to be way closer together than they were back in the good ol' days.