From what I can tell their is no difference between the 716MB and 718MB irons other than the looks. I am a 5 handicap and am a fairly good golfer and am looking into the 716MB irons... I currently play cally XR Pro Irons. Will I be able to shape the ball more with MB Irons than a cavity back type iron? And... again. What is the difference between 718MB irons and 716MB irons?