Poly strings give less speed, but not less spin than other types of strings. So they have a higher spin to speed ratio, that is the real difference. You can hit harder, get more spin but not more speed (relatively), which basically means more control.
Just my theory but I rather like it.
It seems to work at even very low tensions where BP's deformation theory is perhaps not so much in play.
Edit: Oh, I see now that that is included in the link above, which seems quite comprehensive.
Wilson PS Classic, Gosen OG Micro 16, 26 kg.
Last edited by Povl Carstensen; 07-05-2012 at 09:01 AM.