Ok, I have loved rocs since the first time I threw one. I am trying to get a good stock pile going. I was wondering whaT the difference was in flight of some of the models. I know the difference between rancho, San Marino, Ontario. I am wondering about slight differences, if any, in 10x, 11x, 12x kc pro rocs, dx, dx flat tops, etc. Please don't post about star, champion, or roc + because I don't like the way these feel. They don't feel like a "true roc" to me. But that is just my opinion.