i love the non stick because it's eco friendly, however on high heat with butter/oil, the flame sometimes"hits" the surface and it turns black, i guess, from the oil burning. i don't know how to get these "burn" spots/areas out? i tried scrubing with nylon scrubbers and it takes a LOT of husband muscle power with too much time / effort and some of the pans still have the spots. otherwise the product is great, i have about 9 pan/pots.