ive used them with success. 2 times i had a pi$$ed off gobbler run in and smash the jake that he thought was breeding one of his hens. another time i had a coyote snatch the hen, spit it out and he had the funniest look on his face, like" hmm that dosnt taste like turkey". it was cool. i also have a video of a pregnant doe giving my deke a mule kick, dont know why she did that.
i generally only use em if i've got a stubborn bird thats hanging up in a field or if he's henned up. i got a great video once when i was calling for my dad. there was a big tom about 200 yds away with a half dozen hens, he bet me i couldnt call him away from them. i tried for an hour, then belly crawled 40 yds out, set up the dekes, and with some gentle yelping called him right away from his harem.
one of my better (read "luckier") hunts....

try em out i think you'll enjoy using them.
-good luck!
moose