I just got the KitchenAid 12-cup ultra-wide mouth food processor (4KFPM770NK). The first thing I tried to process was carrots using the shredding disc. I first cut them up into more manageable lengths and then put them through the small feed tube. Put the small pusher in and turned it on. To my surprise the larger pusher (which houses the small feed tube) started to push itself up! I could stop it pretty easily by resting the bottom of my palm on it while pressing the small pusher down with my fingers. But is this normal? Seems odd that I have to hold down the feed tube or else it could potentially pop out. Mind you, I tried other vegetables that were "softer" and I did not have this problem.
Another annoyance I'm finding is that chunks of food get stuck between the disc and the lid. Consequently, every now and then I'll have to open it up and pick out those pieces. This is my first food processor so I have no idea if this is considered as normal.
And lastly, is it just me or is the polycarbonate extremely easy to scratch? I knew this beforehand, so I was extra careful with the entire unit. Regardless, after one use there are still scratches in the areas where the plastics rub against each other (rim lid, feed tube, etc.). I know it's just cosmetic, but it's kind of a bummer on such a nice looking small appliance!