Nothing sticks - But everything slides down the slope

After repeated use of each of the three pans a mixed feeling remains: the one hand, the coating seems to be really good, because it is actually liable nothing, and when manually cleaning it seems to no harm.
But unfortunately, all three pans great dimensional instability upon heating: All three vaulted from a considerable paunch, as soon as they were also heated with low power by induction.
And so, for example, the chips had the fun of their "life", as they glided almost frictionless on the ceramic to right flight to arrive at the edge of the pan, instead of being as hoped roasted slowly on a flat surface.
Conclusion: No recommendation to buy, because by the curvature of the pan bottom reduces the available area of ​​the pan to a 2 cm diameter ring around the edge.