I haven't used one ,but some of my friend's swear by them [they use the Flambeau]I'm sure there's other's that work as well,espeacially as the buck's are coming into or in rut .I have put one on my Xmas list .The guy's are swearing that this is the only way to hunt .I know if i had had one 3 week's ago when the buck's were pre rutting I would have gotten my 10 point buck that I missed as he came through my shooting lane .I didn't miss a shot ,but i missed getting drawn .

nubo