Ok
I went to the range last night and did some club testing. I am currently gaming some Ping S58's with their stock ZZ65 shaft. From what i could find out about them it is essentially a lightweight S300 shaft that Ping has True Temper make for them. I had my club guy put a KB C-Taper X flex into a spare ping s58 7 iron that i use as demo club so i can compare to my normal 7 iron.
First impressions are that it reminds of a smoother project x. Has that trademark "kick" through impact and feels stiff in the tip section. However the ball gets up high, flattens out quickly, and then keeps going. Also similarly to project x shafts it has that "heavy" feeling. Where more of the weight feels towards the head. I have to put both my current and the demo on a swing weight scale to see if it is just a swing weight issue but i doubt it. I remember when i toyed with project x before it had that similar "heavy" feeling as well.
The X flex c-taper is quite the beast of a shaft. I have attached a file that i found on another site that compares the raw frequencies for dynamic gold, project x, and the c-taper. Since the c-taper should frequency and play similarly to a project x, the c-taper x flex frequencies out to a 7.2 which is closest to a Project x 7.0 soft stepped once
. I couldn't consistently load the shaft that well and i struggled with it as you might expect. I am going to exchange it for a S+ which is much closer to X100 territory.
Speaking of the S+ i had my club guy put one in a wedge and in that head it felt slightly stiff but it was much more manageable. Since it is in a wedge and less stiff than the x it to me felt like i had a X100 in my wedge which always feels like poop. However ironically i spent a lot of time with that wedge in the short game area and didn't have any issues with it there but in fuller shots it felt like that more traditional PX type feel but with a smoother kick.
As i have always said most good players can with just about anything but usually fall into really liking either dynamic gold type products or rifle products. Generally i've been more of a dg guy as every experiment with project x and now this limited experiment with the c-taper just gives me an odd feel. I did try the KBS Tour for a time as well but those seemed to hit quite the moon ball even compared to my ZZ65 shaft.
I am going to try a c-taper S+ in my demo 7 iron and get the swing weight to match my current 7 iron and see what happens. If i don't like it enough i think i'm going to back to my trusty DG X100 in my next set of conforming irons.