Bests & Worsts Reviews from Amazon

After the first few uses in a 350 oven they seemed fine. They washed well, too, but then I noticed a strange white powdery film on them after they dried. I thought it might just be soap scum, so I rinsed them again, but the white residue reappeared. After soaking them and rewashing a few times finally the residue subsided. Then last night my son decided to make some chicken nuggets in a 425 oven. Suddenly I felt a lot of anxiety and couldn't breathe, it was like every bit of air was sucked out of the house, but no visual "smoke", just a strange chemical smell in the air. He threw the mat he used into water and we had to open windows and air the house out when it was 20 degrees outside! Then after doing some research on silicone mats trying to figure out what that was all about I learned that some cheaper manufacturers will add fillers that can smoke at high temperatures. All silicone is great, but the fillers made for a nasty mat. These are definitely the cheaper version. I am bummed because I bought a bunch as Christmas gifts and now I will have to tell those I gifted them to that they are junk. Buyers Beware. I would be concerned for bird owners, too.