I have actually heard the "buck growl" in the wild on 2 separate occasions. Both times I heard it though, it came from what had to be THE dominant buck. I was actually hunting the bucks that made the sound, but I could never get a shot....even when it came to rifle season I thought I would get my chance, but they both fell off the planet.
I always kind of thought it sounded like a sheep if you ask me, but when I saw the ad for it on TV, it was the same sound I heard. Keep us posted on how it works for you because when I saw these 2 bucks do it, the rest of the deer out in the field scattered except for the doe they were chasing.