I saw a guy using a bear call several years in a row from the same spot on gameland 51. He was very noisy, and I thought it was pretty humorous but I heard he got a bear a couple years ago. not sure it was because of the call though.
Never called in or tried to call in a bear but my uncle bought a call one time to try. Listened to him blow on that god awful thing for 20 minutes before I heard a guy on the top of the mountain yell "I hope you choke on that [censored] thing"! He never blew it again lol.