I have used vanella before, but it does have its own issues.

The biggest problem I have seen is introducing a new smell into an area. I have seen deer spook at the smell, because it is a new unnatural smell. Now, if given enough time, and exposed to it enough, they really like it. But I have seen them spook. Does that mean it will happen every time? NO!! could you use it and the bucks come in on a string to a perfect broadside , yes.

They are unpredictable, and thats why we love to hunt them.