Try this ball if you currently play any of the following:
Titleist Pro V1X
Callaway HX Tour
Bridgestone B330
Taylor Made TP Black
Nike One Black

The Z-STAR X will be longer for most players of the two balls and has a slightly firmer feel without sacrificing control and feel around the greens. 

Overall this ball maximizes its performance when played by those who have driver swing speeds greater than 105mph.

The Srixon Z-STAR X is derived from the Z-STAR platform that incorporates a 324 aerodynamics InvisiseamTM dimple technology for consistent flight with every shot. 

The Z-STAR X has a slightly higher compression and firmer cover making it perform best with swing speeds above 105mph. 

This ball takes distance and feel to the next performance level which makes it a great complement to the Z-STAR family of golf balls.