I recently went to cook something and discovered I really didn't have any good pans anymore LOL after years of use I throw out pans as they have become not so useful anymore with age and use. When I reached for some cookie sheets and discovered I didn't have what I needed I took inventory and realized it was that time again to clean out the rest of the old and get new pans in. I don't need a lot there's just two of us but I'm not going to spend a ton of money on a pan because of the name on it. I simply look for what I need and the item with the best value. So while I was looking around I came across the cookie sheets by mainstay that were a convenient size and definitely a great price. I was not expecting anything other than mediocre at best but these pans are of a really nice quality! I was surprised at the weight to them, they are not flimsy baking sheets. I cannot speak to durability because I have just received them but if I'm doing what I'm supposed to in taking care of them I can absolutely see these pans lasting a long hot minute! If you are like me in need of restocking quite a few items or just simply on a budget which almost all of us are, don't be afraid to get these pans! I review items all the time and not just items that are a big fail. I absolutely do for the good and the bad. If I have posted a review nine times out of 10 it is because it is a extremely awesome item like these are, or they are an epic fail and I want any of you readers to know what your considering either way. I count on everyone else's reviews a lot of times when making a final decision and I always hope to find honest reviews regardless of the outcome and I appreciate those of you who help me. I hope I have helped you make the decision here. PLEASE NOTE THE ABOVE REVIEW WAS FOR MAINSTAY 9X13 BAKE SHEET PANS BUT I FEEL THE SAME ABOUT THESE CAKE PANS!