Geronimo,

I'm not really sure if you can evaluate those rests in that manner... The reason why I say that is the Muzzy actually replaces the bow's existing cable slide with its own teflon slide.

Still, even with all the armature and slide apparatus included with the Zero Effect, it tips my grain scale at 108.6 grains. The Limbdriver weighs in at 106.1 grains.

In other words, no matter which rest you go with... they both would be like adding what amounts to a 100-grain field tip to the mass weight of your bow.