Finally got to use the irons after a very long week of rest.
I am getting about 66% more dings. That makes this a huge improvement over the r11's
A little difference in the spin is noticable, my r11 9 iron went 142 with no spin, now it goes 136.
I have seen that the big difference is with the no spin distances, full spin seems pretty close to my old numbers.
I am playing with the 81 ball,and I would say it plays like the r11 does with the 90 ball.
So very big thumbs up from the Sig