For the record I actually have four 5 iron heads fitted with different shafts so I could try which shaft worked the best, (Stock Apex #4,Rifle 6.0, Project X 5.5 and the KBS tour stiff). I leraned alot about the affect a shaft has on a golf swing/ball. For some reason I decided to reshaft them with the KBS tour shafts, did it myself, fun project, swingweight D-2 the hole bit. I think everyone with normal ability should play stiffer shafts, the ball WILL go straighter and more consistent. Got them off EBAY with Rifle 6.0 which I thought might be to much for me, but I hit them dead straight. Much to my delight most of the blades were very playable and decided to get a set of Apex 98's. I tried everything, Mizuno's, KZG's, Nike.then I found the APEX 98's. Then I started to try some old school blades thinking it would interesting to see if I could hit them. Since then, I have read EVERYTHING Hogan and swithced to Hogan irons, the APEX EDGE PRO's(cavity back forged irons) Great irons,and with my new (Hogan inspired swing)my game got even better. The first season after I read this book was the most fun I've had on a golf course, my irons where pure & straight and my scores droped into the 70's. However, about 5 yrs ago I discoverd Ben Hogans book, Five Lessons and for the first time ever I understood the golf swing, I wish someone would have gave me this book when I was young!( I give it away all the time). For the first 15 yrs, I played with some DCI's and never really thought about changing.
I have been a golfer since I was a kid and have a good natural swing.