Hi, i play a 907 D2 9.5 with a diamana blue board. Initially the factory Aldila regular flex shaft was very "loose/whippy" and was not right for my swing but after switching to the diamana it straighten out. My father's old R7 425 is another great driver that i've hit and was considering adding to my bag but the distance wasn't quite there but very accurate. Waiting for a demo day for the new Titleist 910 so I can try out the 910 D3 as i believe that these huge 460cc drivers are not really benefiting accuracy and overall "usable" driving distance.