I have used many but the Mojo has been the most effective. I also believe it depends alot on the animal that sees it. Some coyotes run so hard at it, you can't stop them. Others are wary of it and alot of that has to do with placement and security. Watching the coyotes lock on to it from long distances many times, they are usually commited and follow the script. But if it is really close before they spot it, it can spook them. usually if it far from the call and they run up on it around a bush or something.