@dphatt I got to test it in the '21 Callaway driver heads because a friend of mine picked one up. To be fair it was not the 505XX which would have probably given it a better chance but to me it just felt rubbery (which is a descriptor I've never used for any other shaft) for lack of a better term and like it was going to just float away if I didn't hold on to it. Misses were all over the lot, and even when I struck it well it just didn't have much to offer me.
I get that it's a fun color and it's kind of the mysterious, pretty new girl at the school dance, but it's a fitting philosophy issue as much as anything. If I'm going to pay top dollar for a piece of kit like that, I want it to be engineered to get out of the way and let me play the best golf I'm capable of playing. I don't want to have to make changes to my (ahem) already somewhat functional swing to accommodate what the shaft is bringing to the equation. It's supposed to be the other way around, and I have enough to deal with getting my ball around the yard without looking like a complete doofus. I also think you can achieve similar fitting effects with shafts that come at a much more reasonable price tag, but at the same time understand that luxury items like this are part of the chase and the fun of being a gear junkie.
I get the curiosity and can appreciate that it will have good effects for some, but I simply am not one of them and I have to wonder if we'll be looking back at the whole "Hidden Technology" thing and laughing in the not too distant future. But maybe not, I'm wrong about such things all the time and if you don't believe me you can ask Mrs. Chubbs.
