I am not a fan... but I'm glad it works for you & Ajax! Hopefully, you can wean him off of it at some point.
I just wanted to add, as a warning, make sure he doesn't begin to displace the pain he gets when he pulls, to other things that you don't want him to associate pain with. For example, you see a child on a walk; Ajax is excited and tries to pull toward the child but he's stopped by the prong. In his mind, where did the pain come from? Pulling, or the child? This is primarily why I wouldn't use training tools that are pain-based... negative associations can happen in a second, especially with a young dog. And they are much harder to reverse than they are to form. Just be careful!
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