Bought this pan in 2019 and I've been favorably impressed with the performance of this pot -- heats quickly and easily. And of course it looks great. However, within a few weeks, a number of white spots began appearing on the bottom of the pan. The spots are resistant to any treatment (e.g., Barkeeper's Friend) that I have tried. All of my cookware is All-Clad and I take meticulous care of them. This is a new problem for me. Very disappointing.