We sell Six-10 in our store. Plus side, it's convenient. Down side, it's pricey. Bottom line, it works fine. Personally, I still use West 105 and appropriate hardeners and appropriate fillers. I also use Smith's CPES for penetration.
Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA