I have the buck roar, and couldn't get it to work for me. Three times I had bucks just out of range, twice they were by themselves. When I 'roared', they would stop and look, but then but their head down and keep walking.

Maybe a 'hot' doe walked through earlier, I don't know. But I would recommend getting a True Talker and the can (if you don't already have one). I have had ALL kinds of luck using these two....especially together.