At first I was very pleased with my purchase. However after the 90 days ran out the pans began to discolor and the non stick wasn't working. It says you don't need to use oil or butter but never says you can't. So I began to use some olive oil and it only got worse. Now they will not replace or refund anything for the two pans I have claiming it was my fault for using oil. My suggestion is to purchase from another company such as copper chef. Those products are phenomenal and I haven't had any issues.