As far as the “ball speed” off the face, we design all of our drivers to (except the Defiant) to be conforming with regards to CT (Characteristic Time), which is the measurement that replaced COR. Different way to measure, but basically talking about the same thing. Our KE4-ST2A are on the conforming list. Our target is to be have this measurement as high as possible, but still be within the conforming range. All others do the same on their premium drivers. On the ST-2A, the 10.5 has the cg slightly lower and deeper to promote higher trajectory, and the 9.5 has it slightly more forward to promote a slightly lower trajectory. The ST-2 non-adjustable kind of splits the difference, designed to promote a mid to high trajectory and lower spin. Of course, how any of these or any other drivers work for any individual can vary. I always like to remind players that although cg is a factor in drivers, loft and face angle will have a far greater influence on trajectory and dispersion control than cg will. On the L Tech, again, designed to maximize ball speeds off the face, within the limits. CG is definitely lower and more rearward to promote higher launch, and the 13 and 15 degree options appeal to a lot of players. Our new STw driver (available in April) was designed with a deep center of gravity and 3 loft options – 9.5, 10.5, 12. the CT numbers are right where they should be – high, but still in the conforming range.