The HALTI harness will stop your dog from pulling if you are familiar with how to use it properly, you fit it correctly and you apply calm consistent dog training techniques.
No product is a magic bullet, but the HALTI harness prevents dogs from pulling better than a standard lead and collar because that is precisely what the product has been designed to do.
If you own a dog that is a problem puller, then the HALTI harness will definitely help you teach your dog to walk more calmly by your side.
If that's what you came here to learn and you don't need to dig any further, we recommend you buy a HALTI No-Pull Harness.