I bought some and started using it. Can't say that I had a situation where I thought it helped - just didn't have deer straight down wind much. But it didn't hurt anything that I know of either.
I got to thinking more about it though and have stopped using it. The stuff comes from deer farms, and in my part of the country there have been a number of CWD cases in captive deer herds. Deer within the fence escape, and suddenly we have had new outbreaks in the wild herd. I am personally convinced that most if not all of our CWD problems have come from captive herds.
Maybe the place making this stuff had been CWD free so far, but how can I know it will always be? There are too many examples of it spreading from one herd to another. The last thing I want is to take a chance on being indirectly responsible for spreading a disease into a wild herd.
Just my opinion, but purchasing products made from captive deer has indirectly ultimately led to the spread of CWD. And in this case we are applying actual secretions from captive deer in our woods.
I'm going to pass from now on.