I've used the scent killer. I don't know if it works or not, I never really go out without it, so if nothing else it is peace of mind for me. As far as C'Mere deer. I have found over 25+ years of hunting that the more expensive the bait or gimick the less I really need it. I broke my rule last year and got sucked into the VS-1 Estrus scent which cost me big bucks both literally and figureatively. You might as well just put $25 on the ground and see if the deer will come eat that.