I agree with Kevin on this one. That bit is not something to not use ever. That bit could be useful sometimes. We have a horse that is very hard mouthed, he was trained as a driving horse and because of poor horsemanship and stupid owner his mouth is ruined. He is so insensible that even with spurs is hard to control him. He is very sweet but he doesn't respect the bit. So in his case I will use such a bit, but only with someone with good hands. I will not put a novice rider on him, or myself. With such a bit you must know what you do, and you must have light hands. And I don't think that you should use this bit often, just for one, two or a couple of days. You need to teach the horse to respect the bit and then you can change this bit with a milder one.
"I am not what just I am - I am who I am not yet" (M. Heidegger)