I've been using grunts, bleats, snorts-- whatever since the mid-80's.
Yes they work, but often not in the ways you want. I've learned to generally stay away from them. When I do use them, I use them sparingly.
Let me give you a theoretical example. Let's say you are trying to lure a buck out of a treeline. You grunt. There are a herd of doe that you don't see that hear this, and decide to move off to get out of the way. The buck hears or sees the doe moving off and follows them. You have no idea anything ever happened. All you know is the forest became quiet.
