A couple years ago, I was in my stand hunting some thickets. I heard a doe bleeting sound...I thought it was my friend walking to his stand turning his can over as he made his way through the woods. 5 minutes later..a doe 50 yards out in a field starts bleeting..and it sounded exactly like "The Can." Right in her tracks...a 6pt buck.

My personal experience with them has been up and down. I haven't called any deer in with it..but it does get their attention for sure.