I was helping a RH-bowler, who was a cranker, try to move right, but all of his equipment was drilled with strong back end motions that presented angles that were too strong for him to get over the 2nd arrow.
Sold him this ball, laid it out, and had it punched up. With left foot on 22, he was able to roll over 10 at the arrows, and push it to the break point about 4 and carry the front 8 before he tapped a 10 pin. He never had to sacrifice his tilt, speed, or hand and was able to shoot comfortably without change or compromise. Shot his first 700 with this ball and ended the league with a 200+ average (from 180's).
Great ball for anyone who has a lot of hand but wants to stay right. The Grail also has a strong back end motion for those bowlers who dont have a lot of hook in their shot, but need something to roll consistent to the pocket.