I was so excited to get these after I got my blender. Though I love the blender, I wish it came with a smaller blender container, or at least a variety of containers given the price of the blender. The 64 oz is huge. I wanted small cups for small batch recipes. The adaptor is awkward to use and clean. The flip caps on the lids are almost impossible for me to open (and I have no functional limitations). I have successfully made salad dressings, but that's about it. The functionality of these cups is very limited and not worth the price, in my opinion. I wish I'd waited for a better design.