Played 18 holes today with the newest XXIO Prime driver, 10.5 R flex. Remember, XXIOs R flex is basically a fly rod, 35.5 gram shaft. This one has a draw-bias heel weight. It's just like the last model. Easy to hit straight, muted sound (but louder than the Callaway), ball stays in the air forever, and rolls out nicely. It's longer than my Mavrik Max and SWMBO'S Rhapsody for me. If I had $900 just lying around.........