Ive killed 4 bucks in the last 4 years in archery season the first week of november using a bleat can.Every one came running like they were on a string.I think its just of matter of being in the right place at the right time with a buck i the right frame of mind.On the other hand ive never had a deer respond to a grunt call in all my years of hunting where some guys swear by them.Its all just a matter of timing.