This is great cleaning design. I change it every 2 or 3 years. Even though I clean it regularly it still gets funky. It still works but I to it nice and shiny. I want to replace my dual ring burner but the screws that hold it in place are totally rusted. I would like some advice on this. Also I'm waiting for the development of a cooking surface that is half grate and half griddle. Let me know what that's in the works. I think it could be a big seller!