I started using it sporadically last season with mixed results. After using it again this season in a variety of places I have come to the conclusion that it is really dependent on the type of soil that you apply it in as well as the actual physical location of the site in relation to trails, topography, etc....
Recently I posted some Deer cam pics over on the bowhunting forum. Those pics were of two bucks frequenting a site where I had placed some of the deer cocane back in July. You can see by some of the pics that the hole is already 6-8 inches deep and about two feet across.
...on the other hand there are two other locations where the deer did not touch it.