For a solar cooker to gain wide use, Noel says it has to be user friendly, get hot and retain the heat, be inexpensive to build. and be durable. He asserts that this design gets very hot quickly and retains and replaces heat more efficiently than any other passive solar oven for its collection area. The design can be made for less in developing countries, with basic construction for costs, yet not compromise its user friendly facts, or its high temperatures, or can be made from more durable materials (e.g., steel) for the more affluent western countries.