I have used one from Primos and it has worked for me a few times, other times they just go about their business. It is definitely a call to have in the pack in early season. If you are going to use it, well use it. I use to have the problem of being reserved when blowing. Mental thing I guuss. Most success when screaming with it. mooooooOOOOOOOOOOMMMMMM. LOL, that's the best I can describe.