I have used a few times in the form of spherical cake. The baking process and the dissolution of the cake from the pan fold fine. Only one thing is important: even if I had the impression that the hemispherical, to the brim filled with dough form would some relatively stable on the wire rack in the oven (which is actually more of a balancing on the ball bottom is), so I was really very wrong. For when the pie dough rose, the cake pan got flip side, tilted a little to side, the dough wobbled out and the oven then looked ... Even the three coffee mug, I asked about the mold in order to increase stability, proved ineffective.
So it's really helpful to make a pedestal under the form, for example, a small metal bowl or a glass (hopefully withstand the heat). Well, even so, the shape is stable and the result is great.