Granted the numbers are a bit skewed because having taken lessons and playing a lot more since I got my mizuno. Shaft in old driver was a 5R ATMOS and I could only control it with a swing in the 90s. Producing a lot of heel strikes. New setup is Stealth 9 degree, Smoke Blue 6S. Consistently getting 101-102 mph swing speed with trackman and 2100-2300 spin. Normal miss with old was a slice, new setup had one push but mostly draw during fitting. Felt very forgiving. Now just need to work on AOA as it was about -.5 for most shots.