I used the Primos can call last season and took a nice 8 point that was racing after does with his nose to the ground. He came in like he was on a string and then I grunted at him at about 30 yards to stop him for the shot. The best way to test these calls, in my opinion, is to try them out on deer you have no plan on shooting. For example, I watched a nice buck come out of a draw below my stand on opening day. Problem was, his entire left main beam was broken off from a fight (he was also pretty roughed up looking). I wasn't going to shoot him and there was little light left in the day so I thought I would see how close I could get him to come in. I threw him a few bleats off the can and he picked his head right up and came right toward me. This was at the tail end of prime rut, but those things do work if used properly.