Great interview about KBS.
On a side note, the guy there in the video created Project X. He had a falling out with True Temper, and started KBS shafts. I have these in my Mizuno, and they are just amazing golf shafts.
I noted that Kim's philosophy is all about the stiffest shaft you can load, and the stiffer the shaft the lower the dispersion.
I use the KBS shafts in my Eye 2's. I really like them myself, but I know the decision of what shaft to use is based a lot on how you swing your club. The KBS stiff just worked out for me since it's between the Project X 6.0 and 6.0, with a rating of around 6.2-ish I believe. I could be wrong on that one though.
When I bought my Eye 2's they came with X-Stiff ZZ Lite's in them since the owner previous figured that the shaft that bent the least would always be the most accurate. Swinging those shafts you could definitely feel a noticeable lack of flex to them.
Lots of love for KBS from me.
I just bought a set of x stiff c tapers because I finally added the 4,6, and 8 irons and I convinced myself a couple of my existing irons were showing slight damage and didn't feel right. I also decided to go for the X straight in rather than soft stepping it once even though I loved it, since I have been loving some of the stiffest shafts on the market in my other clubs. Well, I pulled the more heavily used irons and sure enough, they were all slightly bent in the same direction at the hosel. Granted I had built my swing this season through trial and error with tons of balls hit hard off range mats, and I had noticed my 3 and 7 iron acting up which were bent the most. I don't blame the manufacturers one bit for it though, they were built to be hit off grass.
Even though I think a dynamic gold might be a bit more durable, I got the same shafts again at a decent deal and put them in. As long as I don't get the same problem so quickly again, I'm happy to pay for the quality. I'm sure whatever else I buy will be worse performing and just as easy to damage so why bother.
After a couple rounds, I decided to soft step them after all, since I'm thrown off by the extra stiffness. Shots that were supposed to draw just don't finish coming back though they do with my woods, and I can't get my timing or setup quite right.
Also, the KBS wedge shaft; not the hi rev or the KBS tour's PW length shaft, is incredible. I have it in my SW and LW and I enjoy the crisp feel and spin control on pitches as well as the controlled trajectory and stability on full swings. Plus the black nickel looks amazing. It's really debatable whether I want to get one for my PW as well, but I think I'm better off matching the irons since the head is part of the set.
A note on the C tapers: I've never hit a shaft in my life that's been anywhere close to too stiff until I hit the X straight in. I could swing them as hard as I possibly could when they were soft stepped and they just worked better and better, but the standard X required me to shorten my swing and jam the ball to get any loading. Trajectory was great either way, in fact it barely made a difference, but the soft stepping was crucial. I suppose I could have gone with the simple S+ flex, but I like the extra weight. Anyone considering X straight in needs to either add weight to the head or have very strong hands. I can easily get a triple digit swing speed with my long irons so I usually fit into the stiffest shafts on the market; consider the CT x soft stepped to be like an x100 straight in, but the CT x straight in is like a tipped x100. If you buy your components from the folks at the Golfworks, or use their shaft MPF system, their rating for the C tapers would be more accurate if you soft stepped whatever flex you're getting, as a stiffness of "5C1H" works great for me in my other shaft models but the CT x plays more like a "5.5C1H" straight in. I'd strongly advise people to give them a shot but they aren't for everybody and you need to be realistic about the flex and installation you choose. There's a reason the KBS Tour is used by so many pros; not all of them get the best performance from the c taper.
There seems to be some problem with the KBS tour shafts getting bent near the hozel over time. It looks like it happens more in the longer irons. I am shocked at this. I'll have to keep a look out for this.
C-Tapers are monsters. When I was getting fitted for my Mizuno's the C-taper actually gave me better numbers. I was swinging pretty fast to, so I wasn't comfortable with them if I let up. So I went with KBS Tour X. They have about 500 RPM more spin, and slightly higher launch than the C-taper, but I think that will help if I keep my swing in a smoother tempo. I don't think the slight difference in numbers was worth the up charge.
As for soft and hard stepping, here's a great article on it, http://www.golfshaftreviews.info/index.php/soft-stepping-and-hard-stepping-iron-shaft-sets/
The reason why the stepping does this for KBS is because all KBS does is increase weight to increase stiffness. This makes their golf shafts very consistent through the same model on the EI charts (stiffness along the whole shaft). It also makes available that you can soft step to get a whole range of different stiffness with out changing the characteristic of the golf shaft.
True Temper doesn't do this. They change the stiffness profile from their regular to their stiff flexes. So if your getting fitted and you change flex from a stiff to a regular in True Temper be very careful because the EI chart changes a ton. But if you like the EI characteristics of a True Temper but its a bit to stiff, then soft step.
Just two different mentalities. I get why True Temper does this, they can hit a wide range of people with one shaft model. I personally like KBS because I swing fast, and their golf shafts look designed for better players.