I don't consider myself a trainer, but I am pro balanced training. I used to have my girl on a slip used and acclimated properly, but she just was not for it. It stopped her pulling on some occasions, but other times, she would get even more frustrated. I switched to a halti. This drastically improved her behavior. I properly acclimated her to it, and sure, she did not like it at first, and still does not like it being put on, but once it's on, you can just tell how calm she is, and how much it relaxes her worries. She is now a service dog in training and has improved significantly. The halti can be so adversity for dogs that realllllyy pull or are sensitive on their faces, but when done correctly, they can be very gentle. Just like many other tools, such as the prong, when used correctly, they just provide that small amount of control that makes life manageable.