I have used this Kenmore smooth top convection oven for the past year. This is my 3rd convection oven and it is my least favorite by far. The other convection ovens were by Whirlpool and they were great. My biggest complaint with the Kenmore is it takes FOREVER to preheat. It always takes at least 10 minutes to get to 350 degrees and usually about 15 minutes to get to 425 degrees or higher. It feels like it takes a lot more advance planning to cook with it than other stoves do. On a minor note, the seal on the glass panel was not super tight and somehow something got spilled on it and now shows on the glass door and I can't clean it off. Irritating! I would not buy this oven again after experiencing Whirlpool's superior convection ovens.