The Wilson Staff Pd6 Driver is 40cc smaller than it's Dd6 brother and the head is a little deeper top to bottom to give a larger hitting area.
That said the face is still big enough to provide lots of forgiveness and it is a little more open than the Dd6 so to suit the better player. The standard nano tech shaft feels good and there is wide range of alternative shaft options for the Pd5 driver.
The flight of the ball was good although the head did not feel as lively as similar models at impact. Overall the Wilson Staff Pd6 driver is a solid club and good value for money as it is a little cheaper than it's rivals, but if you can spend the extra, then there are better alternatives around.