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I use the KitchenAid attachment at home. It's good enough for the amount of use it gets. I don't do enough grinding at home to justify a separate machine for the purpose. One thing the KitchenAid attachment is not good for is stuffing sausages. I did that exactly once, said never again and bought a dedicated 5 lb. stuffer. 

Edit: forgot to mention, there are aftermarket grinding plate sets available on ebay for the KitchenAid attachment that give a much better variety of grind size options. Quality is good (at least, for the set I have) and they're not even expensive.