Review on SHINEURI 6-Piece Nonstick Copper Cookware Set with Lids - Copper Frying Pans, Skillets, and Ceramic Fry Pan for Cooking - 8/9.5/11 inch by Glen Sprout

They don't work as advertised. After 4 months of careful use and following all care instructions, we have noticed excessive stickiness in everything we cook. Pans are also difficult to clean due to sticking. We had a set from another brand that lasted 6 years before we had any problems. I looked for a return and it expired on January 31st 2021 so they have a 90 day guarantee. I understand why the 90 day guarantee. Please check the warranty before purchasing so-called non-stick cookware. Upgrade offered the company a 1-year warranty. Revain gave me his email address and I sent 2 emails asking how to return pots under their warranty and never got a reply. I contacted Revain again and they honored the warranty. Don't buy anything from this company.