I have two bows set up with winners choice strings and cables. Both have the X-coat and I gained between 3-6 fps with the two bows by changing from factory string and cables to the winners choice. I know the type of material WC uses accounts for the increase of speed but in MY case WC and the X-coat definitely does not take any speed away. Also, I use the Dalton high speed bow wax conditioner on my WC as well as the X-coat area of the cables and this stuff is super slick. I do not feel any friction during the draw from the X-coat or cable slide. For those not aware WC only recommends using Dalton bow wax on their strings and cables. I don't know what the difference is but this stuff keeps the string and cables really slick and in good condition.