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Do you mean the little drinker cups, like those that are pictured below?
If so, I use them, and generally like them. My chickens learned how to use them quickly and the water is kept clean. The only problem with them is that sometimes they leak. This typically happens when a shaving or other piece of dirt gets stuck up in the plunger mechanism, causing water to continue to flow out. Sometimes it happens for an unknown reason, though.