I have it in my Halo 4 iron. I like it. I have the 6.0 stiff model. I was worried about it at first, but it’s held up to my aggressive swing and has a good feel. Reminds me of the RCH shaft in my driver.
I had a conversation with Keenan Phillips at the Dream Foursome Experience about the Cypher iron shafts. Based on what we discussed, I feel that these are shafts that I would consider for my next set of irons.