The Blue Denim Quantum 2.0 is another awesome ball from Brunswick. I shot my third 300 with it in a tournement in May. Compared to the Contact Zone-Pro, the Quantum is much more smooth in its breakpoint and backend. Now I do have both drilled differently. The Quantum drilled label-leverage with about a 3 1/2" pin, and the Contact Zone is drilled with a 2" pin stacked-leverage. The Contact has more backend, but rolls later and has less flare than the BD Quantum. The Contact also has a tendancy to be more violent in its reaction at times coming off of dry boards where the Quantum tends to be more smooth and controlable. Now this also could be becuase I have the Quantum drilled in a tamer pattern, but it is a very smooth ball as most Quantums of the past have been. Eventhough I threw 24 strikes in a row recently in practice on a pair with my Contact Zone-Pro, I do feel the Blue Denim Quantum is the better ball of the two. I have seen many negative reviews of the Contact Zone, but many more positive reviews of the Quantum. But if you have the choice of the two to purchase I'd say go with the Blue Denim Quantum. The Contact is a good ball, and it has grown on me recently, but the Blue Denim has been a great ball from the first throw. Good luck!