I went to Golfsmiths Thursday for a Driver fitting and I took my old driver to compare , with my driver 910D3 9.5 and the Oban Dev 6 Reg and an 86 mph SS , I was averaging 235 yds .... then they put my shaft on a 915D3 9.5 and I was averaging 247 yds and my SS increased to 89 mph... it got me sold on the new Driver.. already have it on my Chritmas list , for my age 50 yr old any increase in distance helps =)