shokosugi I think I once read that John Daly played them for awhile. At the time I think they were saying that they were the only graphite iron shafts that were stiff enough for him. I'm not sure if that's true or not, but my shafts are 105 g, torque 1.8, high kick, and 6.5 flex. That's pretty stout.
I picked mine up on Ebay years ago because I always like graphite shafts, but found most too soft (I swung pretty hard back then). I still like a stiffer shaft, with Project X stepless being my favourite shaft I've played. But 115 g is beginning to feel a bit on the heavy side now, so I'd like to try something the in the 105 range (or lighter). The IMS seem to fit the bill.