We bought a Tower ceramic frying pan, thinking it was a quality item. A few months of use and it lost it's non-stick properties. The pan gradually turned a brownish colour on the sides and never again turned white when hot. We certainly didn't overheat it or scrub it until a few months after purchase. By then is was as difficult to remove food residues as any other conventional pan except by scrubbing with a pan scourer. We used the non-scratch nylon variety, but this is proving quite a chore each time we use it. Unfortunately, we haven't yet found the guarantee, but are most disappointed with the product.