It is the only effective tool, out of all the ones I have used, even including dog trainer tips, to prevent the dog from pulling during walks. At first, it seemed like it would bother me and I used it reluctantly... Now, she comes to me on her own to put it on and finally we can have a normal walk!
Note: When someone first uses it, it is good to keep the dog relatively close to avoid any injury to the dog's soft tissues from sudden pulling.