A previous reviewer commented: If you have a ceramic stove top, be warned that these pots warp when they are hot, so they do not sit flat and they do not heat evenly or well.I agree wholeheartedly- these pans are rather thin and have poor heat distribution, especially on a ceramic stove top.On the positive side, they are OK. They might be suitable as a starter set- attractive- have a good non-stick surface (so far).OTH- keep in mind that even with the Calphalon branding, they are cheaply made and will likely warp with high heat.I was a little disappointed. You do get what you pay for....