I don't like them at all, dogs can be trained in a civilised manner as they are intelligent creatures that do not need a electric current passing through them to tell them to behave.
However, a while ago i saw a programme about dogs who believed they were dominant and could turn nasty towards humans, and they used shock collars on them. Before watching it, i was very skeptical about whether even a dangerous dog should be put through that. But actually, it was very interesting, after a while, most of the dogs calmed down and became better family pets.
Maybe they aren't so bad... but definitely way down the list in methods of training
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