CI,

Are you referring to the "Shockstop" cable guard slide?

I picked one up just to tinker with but the "high-low" cable configuration holes on it don't match up with any of the bows that I currently shoot.

It does effectively reduce string noise and vibration...no doubt about that....but I have heard from others that similar devices were tried in the past and they resulted in excessive string wear in the area that they came in contact with the string.