I bought the four side jar for my mixer because it was shipped with the larger wild side jar. I use it primarily for smoothies and didn't need that much volume. With my four side jar I now make my smoothies perfectly every time. I have now even begun to use both jars simultaneously for large prep. It's great. I use the big jar to break down and juice a watermelon and then the small jar is ready for the juice I made to make the base for a smoothie