The porcelain is so thick walls as you are used to the "normal" espresso cups, such as Villeroy & Boch. Approximately 1/2 of what you expect from Roman espresso cups. In previous Rezensentem other products I have heard as a criticism because it is the Espresso cold faster. I say here - keep feet on the ground! I use the cups to let out from a Nespresso coffee machine. As a consequence, the cups are not pre-heated. But who can please his espresso stand for so long that it cools down? No matter how thick the Prozellan? So in my opinion irrelevant. To drink it has a pleasant thickness definitely.
Otherwise, I can only write what the design and that's just fantastic. Here leaves argue sure admirably. But I find sowol the form of cups beautifully as well as their Bemahlung. Properly refreshing and colorful. To longer better than the other classics.