I think turkeys remember a bad experience. I have had birds run across a field to get to my decoys and at other times are coming in hot until they see the decoys and then putt and go the other way fast. I have probably taken more birds without setting them up because I like to run and gun and often don't have time for a set up. Just like others have said either they work or they don't and you never know. The last bird gave me the slip 2 days in a row when he saw the decoy. The third day I set up in an ambush spot without a decoy and with minimal calling after he heard me and was coming in.