I've played these irons with SteelFibre 120cw shafts for all of 2017. I honestly believe they have changed my game. High, straight, crisp irons have brought my index down to a 4.3 (up from that now), helped me win my flight in a few tournaments, etc. I love these irons....
...except for one thing. I cannot work them right to left or left to right. My belief is the same thing (tungsten weight) that helps get the ball up---keeps the face square at impact.
Does anyone else have this issue? I am probably going to go to a 716 or 718MB in my 7-8-9-PW. I know I can work those.