Ok, folks, so here is the TrackMan report from swings with both the SpeedZone and the Xtreme. Both were 9 degrees heads, set up standard and both used the Smoke Yellow, 65, 6.0 shaft. The SpeedZone standard is identified as “driver” and the Xtreme is identified “2 wood.” I am actually pretty surprised at how much higher the spin was for me with the Xtreme. The highest ball speeds were with the Xtreme, but the overall average swing speed and ball speed are nearly identical. The dispersion was better with the standard head, which also surprised me. This is a very good example of why fitting is SO important. Who would have guessed such a difference in spin with the same shaft?