After reading this entire thread, i went and got fitting and purchased the XR Irons last night. I started out with the Speedstep stiff shafts. They were noticeably lighter then my current setup (Ping G25's). I was swinging the 7i about 68 mph and hitting the ball about 160 on average. The shots were very high which i really like and you could tell by where the ball "started" on the screen. It was about 7 feet from the ground. I have never seen it that high. I then moved to the KBS Tour V90 shafts and the club came alive for me. Ball was about 5.5-6' off the floor on the screen so you could tell it was launching high but not as high for me as the Speedstep. But the interesting thing was my swing speed was 72 on average with the KBS and the ball carried about 168 on the monitor. I did not see any flyers and the dispersion pattern was about the same with both shafts being a slight draw about 10 yards off center. I ended up getting fit for 2 deg upright which may help straighten it out a bit. The KBS shaft seems to fit this club well at least for me. I saw greater distance than my G25's for sure, and slightly higher luanch.