I have mine drilled 4 1/2 x 4 3/4 i like it in box finish, a staffer i know says it really picks up in the mid's at 2k no polish.
He states that most league bowlers will prefer the overall hook at 2k, i have no tilt so for me the 4k box is perfect. I have many other balls like the Special Agent if i need more mid lane performance, i really like the ball and i will be grabbing a Sure Fire when they release in a few more weeks.