I have a few and a couple nice custom grunts but my favorite is the extinguisher I set mine for the perfect tone I think sounds as realistic as possible and I taped it all up so the slide won't move...
I've taken many bucks mostly 6 pointers or less with that call and never spooked a deer with it,,,,, but how I use mine is I just blow a single very quick light volume grunt every 1/2hr or so just to let other deer know there's some deer over there and the deer if any do come in they never run right in usually if they are coming they take their time and walk over kind of casually looking around like calm deer do while browsing and eating they never seem on high alert.