For baking, no complaints: the curl keep the steam well and ensures a slightly faster even cooking with the foil. In the microwave, they are downright brilliant: the cooking time of vegetables is halved compared to a flat plastic or ceramic with microwave cover! Only downside: the smell. Despite all we hear these twists take good smell of food, particularly fish. And in time, the smell increases and becomes rather nauseating especially first thing in cooking. I wrote Mastrad twice without receiving a response. The good news is that the smell does not spread to food. In short, for fast cooking and green, excellent! For odors: to improve!
