Happened to be looking at drivers when the New England Mizuno rep came into the shop. He took me out to the range with a ST200 10 1/2° head still in the wrapper and 7 R flex shafts he had in his van and he had me go through a medium size bucket of balls while he blind swapped shafts. No monitor, just his eyes watching ball flight and him looking at the impact marks on the head. Settled on the Tensei Orange after seeing about 20 yards gain in distance and the tightest dispersion. Ended up buying it as a used demo for $249.50