The cast iron cover has barbs that improve the condensation of steam and continuous irrigation during cooking of the content.
The advantage of the jigsaw couple and cast cover fits in the possibility of using it for baking.
I put 4 stars because the cooking background honeycomb that is supposed to better distribute heat. Did not test the flatbed model, I can not say that this is true or false. But my experience allows me to write that when accidentally cooking your ingredients stick to the bottom and with the help of the spatula, fill the cells, cleaning that follows is similar to the hell of Verdun for you will have to finish scrubbing the nail and cell by cell.
When used properly, this utensil is no age limit, so you can include it in your legacy to posterity.
The price is forgotten, the quality remains. And monitors the cooking.