The ZWILLING ENFINIGY Personal Blender is good for single-serve smoothies. It's designed for personal smoothies and protein shakes and comes with a drinking lid so you can use the 24oz jar as a travel cup. It does an excellent job processing fibrous ingredients, so recipes with kale or blueberries have a smooth texture. However, some personal blenders make an even silkier blend with tough ingredients. Also, you can only run the blender for 40 seconds at once, so you need a few cycles to make a smoothie.