shafts are are simply a matter of personal preference as to what amount of "feel" you are looking for. Amount of deflection,stiffness,feel, etc.. are all personal choices and only the player knows what feels best to he or she. as for playing certain shafts(predator,ob1) and others the player is probably compensated by the maker of the product for using the product IN PUBLIC. I was a golf professinal for many years and can tell you that is the way golf club manufacturers operate. Golf professinals arew just like pool pros in that they can play at an ultra high level with all of the major manufacturers equipment, so in most cases the decision comes down to a financial decision. It is widely known tht Taylor Made golf has paid their players more than other club manufacturers for years to play their drivers. While all the man. pay their playes to play their equipment, Taylor Made started it all with their campaign. Callaway golf, about 4 years ago, offered men and women players on the pga and lpga tours 3000 dollars per week to play theirnew(at the time) big bertha 11 driver. if you finished in the top ten that week you received 10000 extra and if you actually won the event you were given an extra100000. Now while these numbers arent typical of most endorsment contracts it is how companys get players to play their products in tournaments where everyone(cameras) will see their product. the top players like tiger ,phil, ernie els , etc... change equipment companies every 3 to 5 years for the endorsement money not because they like the new equipment BETTER but because they can play equally as well with the new companys equipment.(everyone knows that tiger played titleist all of his life and signed with nike for the money) he still putts with a titleist putter and used titleist wedges for years after the change before nike designers could get them"right" mickelson left titleist for callaway for 6 million a year . im sure the money in pool player endorsment arent close to these but i can promise you that the top players play at almost the exact same speed with any of the top equipment.