Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Quality has gone down

I previously reviewed the other Alex set that comes with the duck sponge. My son got that as a gift and they lasted and didn't melt. Now that my daughter is old enough, I bought a set of these without the sponge for her. They were terrible and melted and wouldn't come up out of the holder. They don't write well on wet tile at all, so what is the point of being able to use them in the tub??? I think they have reformulated the crayons or something because the quality has definitely gone down since 4 years ago.