Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Exploded during first use

We have used Pyrex in the past and been pleased with it. However the first time we used this item, to pour hot tea into it, the cup shattered. Exploded might be a better word since the glass shards shot everywhere. We have an older 1 quart Pyrex cup that we have used for years for this same purpose without problem. As such, I am not inclined to believe that we were using this product improperly. This leaves either a defective individual product or a larger issue with manufacturing or materials. I will likely try a borosilicate glass product in the future. On a positive note, I purchased this product from Amazon and they refunded my money.