The retail cost of the proprietary true spec GD shaft was the same as other GD shafts, so if that was the shaft I was fit into, I was going to get it. I can see that it might seem fishy that I was fit into their proprietary shaft just so they can make the sale, but I tested 7-8 shafts, and saw the results for myself on the screen. If it wasn't the best shaft that fit my swing at that time, then I wouldn't have bought it. Maybe there's a chance he played with the trackman settings between shafts, but I would doubt it. My fitting was outdoors on the range with trackman. I specifically go to this location because it is done on the range so I can see ball flight. Proprietary shaft or not, it was hard to argue with the results I saw during my fitting at that time, and what I was looking for from the fitting. Just my humble 2cents opinion...