You already know how much I love my Aerotech SteeFiber Private Reserve shafts. It seems like whenever I'm fit for irons these are one of let's say three different shafts that always seem to work best for me.
And this guest review of the SteelFiber Private Reserve by Curt sounds like he's also found iron shafts that work best for his game as well. Curt won a full set of SteelFiber Private Reserve in my PGAPappas 12 Days of Christmas Giveaway and says he's "finding the center of the face more often," and his overall iron game has gone from "pretty inconsistent" to "showing tons of promise."