It's great only if the horse works properly in it
Love using it on all my horse
It is very agrissive so don't use it in horses which back is still very week
I really like using it as it activates the hind end of the horse, but you have to be really careful that the horse does not come behind the vertical with its head, as the mouth is in direct contact with the hind legs. And if the horse bucks it gets a jerk in its mouth, so the horse has to be properly desensitized and prepared so that it does not hurt it self.
it's a good way to work specially the back and also the neck