I am with pops and Nightwing. It v's it up and makes like a rear sight almost, forcing it to center on the intended spot. I don't check it, unless at 40 yards or over, but I figured it out after wondering why my broadheads were always going to the inteded target with remarkable accuracy from longer ranges of 40 and above. My Brain had already figured it out, so once I paid attention, I saw why.
However, at all ranges it definately keeps the windage in line because it offers your brain a secondary confirmation all is well. I really don't know how to explain it any better than that as it is all subliminal, but it has tightened my broadhead groups to the point I can't shoot groups anymore without tearing something up everytime. BTW, I shoot a Snuffer too. God Bless