Faterson: Oh my, but the Tour balls are going fast!
I've just played the Pinehurst CTTH challenge with a new Tour S ball, and it was half spent after I hit the ball 9 times!
That really seems extreme. At that rate, a Tour ball wouldn't even last one full 18-hole round... And I didn't notice any miraculous spin performance, either, despite hitting with the high-rated (for spin) TaylorMade Tour Pro clubs...
I need to apologize & retract this statement. What happened was, that despite my having selected the Tour S ball for the CTTH round and pushing the Save button, the previous GI-S ball somehow remained in my bag instead... (And it had already been spent about half-ways before.)
I've now played another CTTH round, making sure I was using a brand-new Tour S ball, and the 9 strokes depleted the ball by less than 10%; just a smidgen on the durability indicator, maybe 5% or less. That's acceptable for me, and I'll happily continue buying these advanced Tour S/SD balls. I also noticed and appreciated the enhanced spin performance in the Tour S ball in comparison to GI-S.