I like the concept, I just use my mouth call and slate combination. The fighting purr is deadly if used in the correct situation.

My favorite time to use this call is if I have a gobbler that is hung up out of range. When you use the fighting purr, you are simulating two jakes fighting over a hen. This is usually more than the gobbler can handle and he will come in to investigate. I don't use the call often, but it will produce results if used correctly.