I bought a new baking stone at Sur La Table last week. It is a lot heavier and thicker than your ordinary baking stone (14 x 16 x 5/8). I'm really impressed with how it is performing. My oven is definitely getting and staying hotter and my breads are cooking more quickly and getting browner. My new stone, made by Best Manufacturers in Portland, OR, is lighter in color than ordinary stones and seems to be made of a different type of material. Anyway, I highly recommend it. It was worth the $42.