I have used the Bow Grunter Plus for around 5 years and it's the only one I have used, that I know has brought deer in!
I have turned deer around with this call!
It is advertised on the Outdoor Channel, on "A-Way Outdoors"!
It is adjustable from fawn to dominant buck!
It is an "inhale" type call, so it won't freeze up!
Works for me!