I'm not even a reviewer but I put this shaft in the hands of a guy with an average swing speed of 120 miles an hour today. He's a decent ball striker and hits the ball a long way as you can imagine. He absolutely crushes the green Kevlar in a 72 gram stiff with a Cobra Biocell + set at 9.5 degrees....we played 18 together with it and we both tried to get it to balloon into the wind and it just wouldn't. I must say that under those conditions this is a very promising development. I don't have specs or spin or anything at this point but those things don't matter on a golf course. It just flat out performed today.