hi
lee westwood still uses ping zing 2 and there at least 17 years old but he thinks there so forgiving he wont change, there a few players the have kept there iron heads but changed the shafts but most pros change up to the new model of the company they are with. not all new clubs feel as good as older model and it has nore to do with feel that if there better, i would say new clubs are more forgiving that older apart from ping zings.
bill