With nearly fifty years of hunting experience, I can state with certainty that it’s not so much the brand or model of a gadget, as its use and application, that produces. Waaaay too many hunters use a grunt call like a duck call, loud and frequent. So unless you’re targeting yearling bucks, don’t give your location away by random grunts. Use your call judiciously and with restraint, calling only to bucks you’ve already seen. If he’s coming your way, shut up and let him come. It may take an hour or so. Mature bucks are mature because they’re cautious. Don’t “blow” (pun intended) a golden opportunity to harvest the buck of a lifetime just because you’ve become impatient.