OMG I am a convert!
I have a White Shepherd Stella and whilst we do static drill of any discription she is nearly perfect, heeling or just walking down the street it is a nightmare to keep her focus on me and stop her pulling. For some time I have been reading this and other threads re prong collars and today I brought one, I felt dirty buying it, on the Victorian collar black market.
I have read and watched all I can find on line so I think that I am using the collar correctly. I took Stella for a short walk around our block, less tha one k, by the time we got home she was walking with a dead loose lead for the first time. I did not have to "pop" her at all, on a check chain I seem to do more "popping" than Rice Bubbles, all that was required were three quick direction changes early in the walk and her focus was on me and where we were going. She did yelp once but there seem to be no ill effects, no breathing noises and no sore shoulder for me.
I will keep you posted on our progress.