My husband bought this for me as an anniversary gift and I was so excited about them! I couldn't wait to use the silicon baking sheets. I used them once and I really didn't see a difference when I baked with the sheet and when I baked with a regular sheet. After I washed the sheet, I could still see the grease outline of the cookies. It took a long time for those marks to go away. I don't know what I did to finally get rid of them. Now, I'm just too lazy to use them, especially since I didn't see any difference when I used them. Now I use them for other things, like rolling out dough, lining a fridge shelf to prevent a spill and for easy clean up. We also use these for one other thing: making tortillas. We found that the silicon sheets don't stick to the tortilla dough, so we put one sheet on the bottom and one sheet on the top with the tortilla dough inside. Then, with a heavy cutting board, we smash the ball of dough and have a tortilla. The dough easily comes off of the silicon this way and it's the best method we've found!