Typhoon Gary, watch the second link I posted from Alistair Taylor. It’s a real world test. And like most high cor heads the thinning of the face would crack for high swing speed players. These heads are designed to match your swing speed to the proper face flex which will give you the ball speed you should be producing.
The interviewer is Russ Dryden, guy knows a ton about shafts and fittings. I forget the name of his website/company.
The video with Taylor testing it makes sense because he's more of a high SS player. Now he may not be in terms of yourself or long drive guys but compared to the average golfer he's up there at 107mph. So he has the speed to take advantage of the HiCor driver. But from everything I've read, the guys who need it most, the 80-90 mph guys would be lucky to get 5 yards.
Tom Wishon had the .90 Cor driver head and even Tom admitted it took a higher SS to get real gains from it. I had one and didn't notice any gains. Now that was a few years ago and maybe Krank is on to something new but I doubt it.
And like I posted earlier, every test of Krank drivers I've seen, they came out middle of the pack at best for distance, yet the Krank guy says even their normal driver is longer.
Who knows it may work as he says, it just goes against everything I've ever read about HiCor drivers, ie that the guys who need them most, the low SS guys will benefit hte least from them.