The pictures show not the optical defects which particularly show up at the larger size flat plates. The smaller dimensions are concerned, however, the problem is not so obvious. What is meant is that the external shape is not square, but rather trapezoidally fails. The radii of the outer rounded edges are all different, so that variations in the width can be up to about 2 cm. Unfortunately, this spoils the visual impression very. In no event which is by the supplier, but rather to a lack of design in the production or in the general manufacturing process that does not allow uniform shape - round shapes are quite well controlled by the Arcowerke. I would also prefer to rely on a round shape when it should be because vitroceramic. It should also be noted that the price-quality ratio is already awesome and so everyone should decide for himself whether he can live with the optical Macke.