Bests & Worsts Reviews from Amazon

High chance of mold in the lid around and under the spring and behind the flap. Very hard to fully clean. Do extreme cleaning on this, we never noticed the hidden mold and have been sick and feeling horrible for a few weeks. It doesn't disassemble enough to clean all the way. We would wash them daily. Found chunks when we used a tooth pick under and around the spring. We absolutely loved these cups at first, we have about 6. We will be searching for a different design that we can actually clean thoroughly.