I have two of the rooster collars, but have not tried them yet. Neither of my current roos is bad enough to inspire me to catch them and put it on. I bought them before I sold my maniac Welsummer. That guy was LOUD and he never shut up.
Oh man, you have to let us know how it works, as soon as you try it. There are several of us here that want to keep a roo but can't because we are in the city.