I like this oven, it's efficient. But the sheet pan...the coating is chipped on the outside corner, maybe because I use it too often? I bought it less than half year and used it 3 times a week.Not sure whether it's still safe to use the sheet pan since it's non-stick coating. Now I'm trying to find a new pan which can fit this oven, but it seems it's quite hard to find a 13"X13" pan in the market...LOL