I kind of view it like this:

- the deer may ignore it
- the may come, but was he coming anyway?

With the roar/growl calls, they may work cause they are new sounds that haven't been coming from hunters before. The deer always used/heard them, but never associated them with hunters. the "can" was the same way, I had GREAT success with it at first, then as more and more were sold, I get less and less reaction to it. Same will happen with this call.

My son got one for Christmas and it is different sounding than a grunt, I can't make the sound with my grunt call. His MAD call is a great sounding grunt tube that also makes the roar/growl.

Will it work?? Beats me, but I call when I hunt as much to break up boredom and as anything, and I believe I called in 3 deer this year, at least they showed up within minutes of me calling.