I was at GG the other day, and the guy actually said I could step up from the stiff flex, to extra-stiff based off of their data. They handed me a funky looking 7 iron with a clipped on thing that measured my average clubhead speed at 91 mph.
No clue what my driver speed is. That was just swinging the one club 4-5 times.
Is there merit to this, or is he just trying to make a sale?