Well if I had to decide on what decoy to carry, set up time, effective use, all around use, price etc, it would be the woodpecker. Do I use a decoy on every stand, no.
Yes they work, will the coyote come if he sees the decoy, probably. He for sure will stop at whatever distance, long enough for the shot, hopefully.
I believe a decoy helps in focusing the critters attention on the area, making it come closer to investigate. But some I've called come running in so fast, it wouldn't matter what decoy I was using, they were coming no matter what.
Will you call 50 more coyotes this year if you use a decoy, no, but you might get the ones you call in to hang around a little longer so you can anchor them.
Just another tool in your bag of tricks is the best way to look at it. But do keep it simple and cheap. /ubbthreads/images/graemlins/grinning-smiley-003.gif