I just punched out an Impulse Zone. I can't imagine the hook potential for a UI compared to the IZ. My IZ was drilled to hook, mind you. But was a LOT more than I initially was looking for. With my ball speed(17.5ish mph), I was able to make a move left and play deeper inside than I had originally intended. Most people will tell you that a UI hooks more, but I'd be hard pressed to believe that's it's much more than a few boards with my ball speed.
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Pain is weakness leaving the body.
Think Pink.