I love how organized I can keep my cupboards with these containers! I only have two complaints: 1. if you have food in the container and it falls, the ring underneath the lid can break and have sharp edges when it breaks, and 2. the 3 cup containers seem to disappear (lol, not a product complaint, I think this is a husband complaint, we used to have about 15 of the 3 cups and now we have 3). Unlike most other containers, these do not stain easily. I only have 1 container out of all of them that is stained, and it was already stained when I got it from a family member.
My only other complaint would be the price of the single pieces. They're priced fairly well if you get an entire set, but to replace the 3 cup containers, I'll either need to pay for another set, which I'll end up with pieces I REALLY don't need, or pay a lot for them.