I didn't check out your other thread yet, but the first thought that pops into my head is "How much weight does that "thingee" add to the center of the string?"...and, "How much is that going to slow down arrow speed?".

I guess either question would be irrelevant if I am already shooting a 320 fps bow with a 500 grain arrow...<img src=icon_smile_wink.gif border=0 align=middle>