Instruct: Classify Amazon reviews into positive or negative sentiment
Query: May not be worth buying

I've owned four Mindfold eye masks in the past 10 years. The design is wonderful. The mask is comfortable, stays on, and blocks all light. Unfortunately, the material used to make the mask has gone down dramatically. They switched to making the mask with a low quality plastic in the late 1990's. The plastic cracks easily and quickly, within a few days. As mentioned by a previous reviewer, the plastic edges are sharp enough to cut yourself. The worst part is that Mindfold didn't always use cheap plastic. The first mask I bought in the mid 1990's used a plastic that took 3 years to crack. I wish they'd use high quality plastic again. Then it would be the best eye mask.