Anyone have any input on the main difference of these two are? I recently just picked up a 4 716 t-mb that was relatively cheap and in great condition for being used, but I was wondering if the 718 added something to make it a significant change? Looking to get a 2 iron now of them to replace the hybrid possibly. Looking for any kind of input on bag set ups. My home course is a short but really tight layout and during mid summer ends up being very fast.