I had the opportunity last fall to go to Oceanside for 917 fittings. Dino moved my driver from 180 to 200 yards. Pretty impressive, right down to a smash factor on the longest of 1.52. Unfortunately, club head speed was only just about 80, and had been 86 6 years ago. Just a recommendation that after 60 - rethink what you have and consider getting fit if it has been 10 years since your last.. The 917 maxed out my swing, so the only way up is regaining some speed. I increased my workouts after the season and added a TPI instructor in March. Have been through 2 months. While I haven't had a speed measurement, I'm hitting 220-230 this year, with a 240 max. That should be close to getting that 6 mph back. We've measured more hip rotation with the instruction. While this was an off-season effort, it will be a long-term lifestyle change. The right exercises to match one's body are really making a difference. Harder than a new driver, but greater potential.