I straddle the line on this one. I agree that there may not be an direct function translation for the movement, but that's true for many movements most of us accept as functional (e.g. snatch, hanging leg raise, evil wheel). I do like them though simply for the sake of variety--if you're a KB purist, it's just another way to not go nuts doing the same movements over and over again without really compromising the benefits of the swing.
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