Bought this to replace a larger unit and it is used only to re-heat coffee and some food items. The box is small. I could have used a larger opening but my fault not the product and that's why I didn't penalize the product. It works fine for my purposes, so I can't comment on full service use.
First one we ordered was dented to the inside. The rep asked us if we wanted to keep it for $7 discount. I thought that was inappropriate granted i just told him that the dent went from the back all the way to the inside. I was afraid to use it and not interested eating food that came out of it.