I've had 3, 900 balls crack, 1 Hammer, and 1 roto grip. All of these went completely around the ball, from finger to thumb, around the back of the ball. All had finger grips and switch grips, and were not used very much, but that right there is a thousand dollars worth of bowling balls.
SRC core. Didn't care too much for my Bank (one of the balls that cracked) but absolutely love my Green Mamba!
Protocol looks good, but I'm not rich, so I can't afford to buy many balls and have them crack.