Personally I think they are more show than anything. It is very hard to call softly with one. Dad made a few using real turkey wing bones, but they didn't sound all that great. Someone told him to get the wing bones from a goose. So I shot him a couple and he made one out of goose bones. To tell you truth is really does sound better...not as loud, but you still only have one volume...loud.
He carries it in his vest for VERY windy days. I havenever heard him get an answer, but he said he has.
There is not such thing as too many guns, safes or fishing poles!