I use a single thicker twisted wire on my one paint. I don't disagree with using any device on your horse as long as you know how to use it properly. I also don't agree with changing bits to every problem. The horse needs to learn about pressure from the bit and what it means, its almost always a training issue not a changing bit issue. My paint loves his bit, its the only bit he has his mouth open ready to take in his mouth and I ride with my seat and legs anyway. When I pick up my reins, he is butter in my hands in this bit, halter, hackamore whatever I put on his head. If the horse isnt responding to the bit properly, he/she needs to go back to basics and learn what rein/bit pressure means, on the ground. I think its fine to use that bit or any other device as long as she knows how to use her hands properly. The D-ring snaffle can be a "nasty" bit if not used properly, its the riders hands that make it "torture" or "bad" no matter what is on your horses head.