Originally Posted by jamo
Interesting. I know Andrew Rice did a piece a few years ago that said face milling added a huge amount of spin, though I was always a bit skeptical of that, if only for the reason Graham mentioned (they would market the hell out of it).
It probably does increase it marginally, but in terms of making solid contact with the ball, not even close enough to make it a huge marketing advantage. Basically if the companies are not putting big bucks to promote it, then it's minimal.
As for the science, I can see it helping create a more uniform area to make contact, but its still such a small area of contact, and the grooves decrease surface area as well to allow for debris to be collected so the ball can contact the face more cleanly. I would like to see the numbers of groove + milled versus just milled.