I have owned to ZC's, and they have been pure medium oil balls. From what I have seen from the Agent, is handles medium-heavy with no problem at all, where my ZC would not be enough ball. I see the Agent to be stronger overall than the Original Inferno, which for me, is stronger than my ZC, so that is where my opinion is coming from.
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Buffalo bowlers are the best all around in the country.
AMF Thruway Lanes Pro Shop employee, and I have no problem saying that I'm Officially a Ball Junkie.