Instruct: Classify a given review into positive or negative sentiment.
Query: They do NOT stay put

This bowls are worthless. The suction cups do not work. I've tried everything. I make sure the surface is super clean, I add a little bit of water to try to create a greater suction, no luck. My 16 month old daughter pulls them up with ease. The bowls are a good size, but if you're looking for something to stay put, these are not a good buy.