I haven't had a blender in a few years, but my smoothie maker has a stick in the middle that allows you to push the food around while the motor is running. My experience with blenders was that large chunks of food would remain untouched by the blades so you would have to stop the motor, and stick a wooden spoon in the try to make it so that when you start the motor again that the food would hit the blades. This would happen to me with ice a lot. With the little stick thing you don't have the happening. Plus my smoothie maker has a little spout to dispense whatever you're making.
I had no idea these things existed until about a year or year and a half ago. A friend had it on her wedding registry so I got it for her and then wanted one for myself. I was so pleased when it turned up as a Christmas present from my mom. : )
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