I have the Tour AD 85 regular flex shafts in my T150 6-PW which I purchased this year. I became interested in the iron shafts based on the performance and consistency I have experienced the last few years in my driver and 3W (both TSi3 models) with the Tour AD XC-6 shafts. Have not hit the stiff version of the AD 85, but my observation coming from Recoil 90 regular flex in my previous irons, is the regular flex of the AD 85 is firmer throughout which helps in control of trajectory. Mine are fit 1/4" long and I have them weighted D4.