Bests & Worsts Reviews from Amazon

OK, time for another lesson from The Vegan Gourmet Chef: The low star reviews, for this great pair of baking sheets, repeatedly mention how they warp when heated. So, let's talk about warping: All metals (all matter for that, uh, matter) have an expansion coefficient. When heat is applied, the atoms in the given material move faster, and the matter composed of said atoms begins to expand. This is crucial information to know, and structural engineers must know how to use it, when large bridges, skyscrapers, etc., are built. To not know it, and use it, in engineering a given design, is to almost guarantee that a structure built without this data included, and applied, will fail, drastically. Now, "How does this apply to these baking sheets?", you may ask. I'll tell you: If you preheat your oven to, say, 350* F, and then take a sheet with your dough, or whatever, on it and pop it in the hot oven, guess what? You are taking this sheet from your 72* F home kitchen and suddenly exposing it to a temperature almost five times what it has "acclimated" to. The result: The expansion coefficient criterion of the very nice stainless steel is thrown to the wolves, the metal suddenly jerks into overdrive on expanding, unevenly, and----POP! goes the baking sheet. Alright, what can you do? You have two choices: ONE: Put the sheet into the oven BEFORE you turn it on to preheat it. Then, assuming you know how to pull out your oven rack without having it crash to the floor, it's a simple matter of dropping your cookies, or whatever, onto the sheet and sliding it back into the oven. No warping, no popping, no problem! TWO: Have a suitable hotplate/mat on your prep surface. Grab the hot sheet out of the oven, quickly place whatever you need to place, on it, and hurriedly place it back in the oven. Keep in mind this is not a great idea, as the sheet will quickly cool off once it's out of the oven and-----it may pop as you are placing "stuff" on it. Also, remember, this door swings both ways: If you take the sheet out of the oven and place it on a cool counter, or in a room at a normal AC temp, it may pop as it contracts, and eject your prize-winning baked goods onto the floor. Tragedy! I've cooked with these sheets more than a few times. They look great, they shine like a mirror and----they have NEVER popped! Not once. Enjoy yourself, enjoy your cooking/baking, feed your family well! I hope the info I've given, above, is of some value to you. Have fun!