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Personal experience did. I just hate how the garlic comes out, the juices spray everywhere, shitloads of garlic is left in them, you don't have any influence on how your garlic is cut and cleaning them is horrible. This is all personal preference ofc, but I don't recommend others to go through the horror if there are much better ways.
For larger batches of garlic I usually prefer large wooden mortar and pestle over the food processor, but this is also dependent on the purpose for the garlic.
Not to use garlic presses. Either chop by hand, or chop and then form a paste with the side of your knife's blade, or use a microplane grater, depending on how (strong) you want your garlic.