That's what I was thinking. The trainer that referred me to it "uses it to bring the horse's heads down. It's like combining a rope halter with draw reins," he said to me.
Otherwise, I was recently suggested by another trainer to use a bit with a nose band to add a little more whoa, which I don't think is necessary at the time because the horse has less than 5 rides on him (in a simple eggbutt). He engages his rear end when he stops, which is the most I ask for right now -- we're still working on the basics so I'm not expecting any sliding stops.
My boss listened to the trainer and told me this morning she was considering purchasing one for use on the horses, specifically the trainer I mentioned, and figured I would get a review about it.