Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not worth it

These cups are made of extremely thin glass and are as fragile as they appear. Within several days of use, one broke from an accident that a normal glass cup would have survived. Ultimately, this defeats the point of owning the cups in the first place. The main reason in buying these is to have the aesthetics of a glass cup without the tendency to break from thermal stress (as normal glasses are wont to do). If the glasses are this fragile, they AREN'T EVEN WORTH BUYING. They're pretty, but just not worth it.