I have been using the the buck roar since september and while I have not had any success with it yet, I do intend to keep using it. I had an 8pt work a ground scrape 50 yards in front of me the last day of archery and then walked away from me, I hit the grunt call once but he was on a mission and never looked back, I have no evidence that the call does or doesnt work but I will give it atleast another season.