I bought one years ago and didn't care for it. Yes, it amplifies turkey sounds but also amplifies every other sound you don't want to hear. Wind, leaves rustling, your "crunching" while walking, etc. I found that very annoying. Plus you still have to sort out the turkey sounds from everything else which is getting amplified. Since then I've had my hearing checked via audiologist and got hearing aids. Mine have an overall amplification of all frequencies but, particularly, the high frequency loss which many have as you age.
Addendum: Plus when I'd hear a turkey I had to take them off and listen again "normally" to get a distance and direction fix. Fortunately my insurance almost totally paid for them, otherwise I probably wouldn't have gotten them !!