I have been very happy with these baking mats. They've done a great job in my electic oven. I bought them in Oct of 2015 and I need new ones now (Aug 2018). Unfortunately, I used it for the first time in my gas oven last night and I guess it applied too much heat because the silicone deteriorated. I will use the 2nd mat and hope the same thing doesnt happen. Over all they have been great. Just be careful if youre using a gas oven.