You know some people say they work some say they don't. I've had success and failure with them. It all depends on how you use it and what type of mood the deer are in. Once had a buck answer my grunt with his own and he wouldn't shut up till he searched every ounce of the field I was hunting. Unfortunately it wasn't the deer I'd been after. Also grunted when I've had deer in sight and they acted like they never heard it.