I am playing Callaway Fusion pro irons from 2005 with factory installed original brushed Project X 5.5. For as little as I am able to play, I can hit these far more accurately further than I could my Titleist 681 blades with the same limited amount of practice.
I would like to try a set of the Wishon single length "sterling" irons, as my irons are my Achilles' Heel of my game. Regardless of iron set, I can hit a 7 and 8 iron well, so I am intrigued by the single length.