Don't like them. Like the reasons and purposes that Chris and JKlatsky pointed out, and we do use them in the beginning classes at our club with some dogs on the recalls and sit/down-stay exercises. In public, the majority of users simply do not use them properly.
This is an area where for me, the party is guilty until they prove otherwise. When I see someone using one of these, I simply conclude that they don't use it properly until they show otherwise. And prepare to move in another direction if we're going to cross paths or put my dogs in a sit and wait until they do pass.
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