You gotta have balls!!! It's not the Syders that give you any speed but the balls they are sandwiched between.The Spyders silence the set-up.I'd used the balls for a couple of seasons before the Spyders came out and they do work as advertised,increasing speed anywhere from 3-10 fps depending on bow and set-up.I've found that adding the Spyders generally breaks even and thats a good thing because you are NOT loosing any speed.A word of caution about using them on a naked string,they could wear the string.On the several Mathews models I've shot 'em on they have been placed on the serving ends near the cam and idler so that isn't a concern for me.Give 'em a try