I am using the xxx factor right now,but the ball is dead.I have resurfaced the ball three times and it is ready to be put down.I have thrown over 700 games with it.I like the ball a lot,and I score well with it.I was considering buying another one but then saw the ace.I throw my ball between 15-17mph and I spin the ball.I bowl on both med/heavy fresh shot and lite/dry carrydown late shot.I want a ball I can play both shots.I play outside or up the second arrow on the early and have to go deep for the late.The xxx factor allows me to do both.People have said they have heard the ace was supposed to hit harder and not allow so much over/under on the lanes.Is this true?Is there a big difference between the ace and the xxx extreme?Thanks for the help!!