The size is so small it is near impossible to put a dry protein mix in and milk. Secondly, I don't like the only way to charge is by USB, it should also have a USB that can connect to a wall plug in a kitchen. My kitchen does NOT have USB ports. Thirdly, I extremely dislike the inability to clean the crevices of the ring, which you are supposed to put soapy water and run a cycle, but it does not get into the crevices well at the ring. And, you don't want to slice open your finger washing it and can't get it wet otherwise to ruin it. Fourthly, so many parts to shuffle around every use it is a bother. I miss my old blender that died.