I bought a set of these for myself, then had to purchase a set for my mom and children. They are very sturdy, easy to clean and haven't warped. I have purchased several cookie sheets throughout the years (I love to bake) and these are very nice. I was concerned because of the price, generally the cheaper the price, the cheaper the product. No so in this case, I have purchased ones that after one baking session the pan never sits completely flat again, these have now been through numerous dozens of cookies and still look new. My mom, who is also a baker insisted that I go get more. My children tried to get me to give them my "awesome" cookie sheets. If you use cooking spray this is a good product for cleaning. I have sheets that turn color & get sticky from cooking spray, these have not, as of yet.
These non-stick trays are wonderful and easy to clean up.
I have some Wilton cookie sheets that are probably 10+ years old. I needed a couple extra pans so I ordered these based on how nice my old ones are. The new pans are no as thick/solid as my old pans and they tend to pop and twist/flex when they get hot in the oven.
Lightweight, easy to clean... Warped the 1st time I used it and now the pans have discolored, too - turning brown. Oh, well. I also wish they were just a little deeper. Ok for the price.
I bought these two years ago and just recently had to get rid of the middle sized pan. The lasted me well enough for all of the baking i do and i needed them in a short amount of time. i only gave four stars because the material like a lot of baking sheets now a days could have been mad better.