The real benefit of calling Dwayne for a cam is his personalized service. He will take the time to discuss with you all of your options, listen to what is important to the buyer in terms of their goals and all the other supporting components, and then he will give you an educated suggestion based on years of experience and dyno testing. To me, this is well worth the extra money, which isn't that much. I know I can call comp myself (or pick one from a catalog) and save a few bucks, but i guarantee a Comp rep is not basing their recommendations on years of hands on experiences like Dwayne.