What exactly do the different swing style ratings mean? I have a Head iRadical MP with an L4 and an L5--what's the difference? As an intermediate player, will I notice a difference? I have tried looking up on the Internet a description of the various swing styles from L1, L2, L3, L4, L5, L6, etc., but I have not been able to find an answer. I would appreciate any descriptions if you know. Thanks.