I bought these cookie sheets because my old cookie sheets were getting warped from many years of baking on them. I decided to go with the Pampered Chef Cookie Sheets because Pampered Chef has a great reputation and I have never had any complaints with previous products I have purchased. I was not disappointed with this product they are excellent in quality. The heat gets evenly distributed across the cookie sheet which helps cook all the cookies to perfection. I no longer have to worry about some cookies not being cooked all the way through! These cookie sheets are very sturdy and I have not yet had an issue with them warping from the heat. Performance These cookie sheets work wonderfully! I have not had any issues with the cookie sheets warping or partially cooking half of a batch. I could not be happier with the performance of this product. Ease of Cleaning The Pampered Chef cookie sheets are very easy to clean! Durability So far I have not had an issue with these cookie sheets. They hold up well and I frequently bake upon them. Design I love how they cook everything evenly so I can rest assured that the cookies will all bake evenly and as a result they also cook faster! Doesn't Stick I haven't had an issue with anything getting baked onto the sheets. The cookies come off easily and clean up is a breeze.