Calaphon, I have a set and a few additional pans I purchased. I love this brand and it's all I use, bottoms are flat, do not warp, the teflon coating has never scratched or worn off. The key is to make the investment, use the proper cooking tools. When I store mine I put pieces of inexpensive craft felt that can be bought by the yard in between the pans to prevent scratching. I've had them for at least 15 years.