I have used both. Hated the Bi-Matrix. It was VERY soft to flex. I consulted with Grafalloy prior to purchasing and they assured me the Bi-Matrix was true to flex, if not slightly stiffer than their other offerings. Couldn't have been further from the truth. I felt it actually increased my spin, but that could be due to the fact it was way too soft for me.
The Comp NT is the better of the two in my opinion. I have one in 85 grams in a driver. In retrospect, I think it would have made a better 3 wood shaft, but it's dispersion is very tight. Not the smoothest feeling shaft I've ever hit. Smoother than the Blue however.
Given my experience with Grafalloy and their customer service recently, I'm kinda down on them right now.
