"The Can" is designed to be used during the rut. Early season bucks are not used to hearing an estrus bleat. In my area, late October through middle December this thing does work in conjunction with a grunt call. Deadly. I have three mature deer on the wall that can contest to this call, if they could. My brother in law will tell you, I called up a mature 9 point for him 3 years ago and he went and bought the three pack. Hunters have all kinds of experiences with these calls, like everything else, timing and the bucks mood all play a part. The same hunter that doesn't have any luck on a couple hunts may hit it right on the third hunt. Remember timing.