Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Awful quality, leaked everywhere

I purchased this pan since because I don't like the teflon coated ones, but it was incredibly poor quality. As some other reviewers have found, it didn't seal properly. Once it was in the oven it leaked everywhere. Even on a cookie sheet, most of the batter leaked out and burnt, which was terrible to clean. I'm not sure of the cause; perhaps slight warping that prevented a seal? Regardless, Amazon was wonderful and accepted the defective product back. I would definitely not purchase this.