After struggling with my Gravity Shift on the carrydown (it would start skidding by the end of the first game), my pro shop took it down from 1500 polish (OOB) to 1000 abralon and all I can say is WOW.
At leagues the ball held the line and I bowled my highest game ever -- a 236. When I got to the third game I started leaving ten pins playing the same line, so I pulled out my T-Road Pearl to see what kind of reaction I would get. It was giving me an over/under, so I switched back to the Gravity Shift and it held the line firm.
I am a new bowler and this is my first experience playing around with coverstock. Thanks to my pro shop (Lane 41 at Earl Anthony's in Dublin, CA) for helping me out!
--------------------
Complete ball arsenal:
Storm Gravity Shift
Storm T-Road Pearl
900 Global Break Pearl
Lane #1 Bullet
Hammer Cherry Vibe
Brunswick BVP Wizard
Columbia 300 White Dot - Blue Pearl