After originally reading about these shafts on this forum, I replaced the XP 90 shafts in my T200 irons. At 71 years of age, changing to these shafts added both distance and accuracy. Best change I've made in years.
Possibly one of the greatest drivers of the golf ball was MO Norman. Not the longest but definitely one of the most accurate. He incorporated a setup with the clubbed 6"+/- behind the ball.