Ultra power. Ultra spin. Wilson delivers on both promises with the new Ultra 100 Countervail. With the update comes new technologies, including Power Ribs in the throat area, Crush Zone grommets and Countervail material in the frame. In addition, the Ultra 100 Countervail's 100 square inch head size, 11.2 oz strung weight and 320 swingweight are user friendly specs for a wide range of players. After a month of playing the Tennis Warehouse playtesters reported back with mixed opinions. The playtesters found a powerful response from the baseline, a large sweetspot and ample amounts of spin, but they also struggled with the accuracy and stability at times when they were trying to be more aggressive. That was also the case on volleys and returns, where the TW playtesters found easy access to power and depth but found themselves aiming for larger targets to keep their shots in the court. Some playtesters found ample power and spin on their serves, while others were left wanting more pace and control. Overall, the Wilson Ultra 100 Countervail delivers all court performance for intermediate to advanced level players looking for an impressive blend of pop and spin.