The Hurricane 8 is specially designed to compensate for the loss of spin and speed that came with the 40+ plastic ball. The sponge of the Hurricane 8 is a hard, high-density, Chinese-style sponge, but it is a new type with 15% more elasticity.
If you are unsure which of the three versions is right for you, the hard, mid-hard, or soft version, try the mid-hard. The hard version has a harder sponge, which has greater potential for speed, while the soft version has a softer sponge, which has greater potential for a spin. Therefore, the mid-hard version will offer a great balance between the two.