The first time on course when centered, the speedzone was 12 yards farther than the Xtreme... my avg distance with Xtreme this year is 292 on Arccos so I have no room to complain. over the course of a full summer I would bet money the Xtreme would have a higher avg distance than SpeedZone for me personally. Perfect balls im sure the SZ has more pop, but on avg bc of less than perfect strikes the Xtreme flat out winsThat is interesting. Jose would know. I have both 9 degree heads. To me, the Xtreme head is neutral. If I am lazy with my swing, the standard head miss is right, for sure. If I make a good pass and release the club head, the standard head definitely gives me more pop, lower spin and more distance. On average, for me, the standard head is about 10 yards longer, which is significant.