Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: My son loves these cups!
Review: These cups have served us well through all stages, and are supportive of a child's needs. I feel that even though the cups do leak out of the little hole in the top (" a vent?") of the green nipple and also out of the cap area, it is very little and only seems to be from lying down. My sons absolutely LOVES these "zippy cups". I can't say enough about the durability and comfort, as well as fun colors. Extremely well made, in my opinion, I have never felt that these cups are leaching plastic byproducts, even when left in the sun. Never makes what is inside smell bad due to the plastic. Despite the many parts, I have only had positive experiences with all of the Avent design cups. They wash up easily with an Avent brush, or in the dishwasher. The handles are great, and the different nipple designs are great for the maturing mouth. Definitely recommended!
