I've been tested 3 times on the ShaftLab, at 3 different stores, and each time I got the same results. My recommended flex for irons was A flex and for driver it was at the bottom of the R flex range. After the second testing, I hit some balls with my irons, X-stiff flex to get a base line to work from. Then I hit some balls with a A flex shaft iron, and it wasn't any better then my X-stiff irons, Then we tried a R flex iron, and the dispersion width was less than a third of what I was getting with my X-stiff iron. So, I'd have to say the recommended flex was pretty close and going up one flex to a R flex was a big improvement over my X-stiff shafts. So you know, I hit my 9 iron 150 yards carry, and X-stiif flex is pretty much what most flex charts call for with that yardage. As for my driver, I play a R flex, which is what the ShaftLab recommended, and my swing speed was 95 at the time. I got in up to 107 now, and I still play a R flex, but I'm leaning to move up to S flex to see if it works even better. Carry distance with my driver is in the 260 yard range with range balls the last time I was at the range. Need to get out on the course soon to see what I'm doing with good quality 3 piece balls.
From what I've learned, I'd say the ShaftLab is the way to go for finding out what flex shaf you really need. It measures how you load the shaft, and it doesn't care what your swiing speed is. From what I've read and learned, what matter is how you load the shaft, and that's what the ShaftLab is all about.
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