I am looking for something that can handle medium-heavy to heavy oil.  I have been contemplating the Special Agent off and on for a while and right when I was gonna grab one, I started hearing about the Gravity Shift.

I am prefer a smooth, continuous, controllable arc.  I figure I'm a tweener or a light-cranker with a ball speed around 16 and medium revs.

So how do these two differ?

i agree also, the special is alot smoother but it can be tough to fight with the back end reaction, i love the ball i love my gravity shift more though it fits my style a little bit better but if you want more of an arc that is definately the way to go i love it... on a house shot with med-heavy (depending on length) it seems for me to be too much i like it more for the longer patterns when it hits the dry it goes straight left for me hope it helps... the gravity can be drilled for control mines not i used layout number 2 on mine.

Jimmy
--------------------
Bowl up a storm

Storm Shift Gravity
Storm Shift SLT PRO CG (overseas ball)
Storm Shift Attitude
Storm Shift
Storm Shift Global PRO CG (OVERSEAS)
Storm Special Agent
Storm Rapid Fire
Storm Core Power LRG
Storm Eraser Boost
Storm EL NINO X-it
Storm Team Storm spare ball (blue and yellow)
(two one got scratched so it moves a little)