I arrowed a nice 8 point last year using one.
He was cruising around and I had some does under my stand, and hefollowing one of them away from stand. Neither buck nor doe grunts would get him to come back. Out of desperation, I bleeted and got the doe to come back. Seepassed right under my stand and the buck followed her,giving me a 15 yard broadside shot.
I may never get an opportunity to use it again, but I'll definately keep it in my bag of tricks.