I bought my personal cup adapter last month and use it regularly to make smoothies. Because there is no way to tamp down a thicker mixture as with the regular container, I start up slowly to let the ingredients mix at a lower speed before turning it up full blast. I also adapt recipes to use more liquid instead of ice and add ice cubes after blending, shaking manually. I use it to blend nut butters that have separated using the same technique of blending at a slower speed to start and that has worked.