We have a cookware set that is a really decent set and was a lot more expensive and doesn't warp. The thing about that set is that it has such a thick heat surface bottom that it takes forever to boil things or get things going, but also, that set doesn't warp in any way however, it is not as scratch resistant as I would like and we do not use metal utensils in our pans, additionally it's not as non-stick as I would like, but we do still use them from time to time. Not nearly as much as I use this Granitestone set though. Ever since we got this set I have been so happy with it. I have read some of the other reviews and I am puzzled as to what they are talking about when they say it's not scratch resistant and so forth. I 100% disagree with those reviews when it comes to the scratch resistance and the non-stick factor. These pans are absolutely amazing. The one and only reason I am giving it 4-stars instead of 5 is because of the handles on the frying pans. Those skinny flat handles are not very comfortable. I had to purchase silicone sleeves that slip over those handles to make them more comfortable to handle. If the handles on this pan set were like the handles they have put on some of their other cookware sets, this set right here would be the end of all cooking sets because I absolutely love them. They are the easiest to clean too. We do not put cooking pans or pots in the dishwasher, we hand wash all of our pans because the soap from the dishwasher is just too harsh and unnecessary. However, if you want to just sterilize your pans, you could put them in the dishwasher after a hand wash and just don't add dishwasher soap and you can totally do that for sterilization purposes. I love these so much I have told a lot of people about this set because I have had a lot of friends and family compliment this set and wanted to know where I got it and how much it was. It was worth every penny and more. Now if they would just change the handle style, they would be flawless in my opinion. You just can't beat that price for something this good of quality. I also feel like if for whatever reason you might have an issue with the set you get and contact the company, they will make it right. This is only a guess because I have had zero reasons to contact them, I am beyond happy with this purchase.