I must admit, I was a little leery about buying this attachment after reading all of the bad reviews. But, one of my main reasons for buying the Kitchenaid Artisan Mixer, besides baking of course, was to get the meat grinder and sausage stuffer attachment, so I could make home made kielbasa like my mom used to. I can't understand why these other reviewers had so many problems. I grew up helping my mom and dad make sausage, so I pretty much knew what I was doing. I didn't have any problems with air bubbles, and the plunger from the meat grinder worked fine to help push the meat through to stuff it. A full size casing fit onto the stuffer just fine, of course you have to bunch it up, but it fit. The end result was perfect kielbasa, and I'm proud to be able to carry on my mom and dad's legacy.