Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Good if your kid learns not to take off the lid
Review: As others have said, the lid is easily removed even by a very young child. The first time we used it, our son took the lid off and spilled the snacks. But after a few times, he figured out that if he took the lid off the snacks would spill, and stopped taking the lid off. We find it very useful for our now 27-month-old (we started using it probably a year ago). It is not perfect but we have not found a substitute.
