I have some issues with mine, though it works well enough, several of my ancient cast iron pans have rings on the bottom (so they wouldn't warp with high heat), they do not sit flat on the induction burner so they don't heat evenly, they work way better on a gas stove. I thought the burner had two concentric rings of magnets but it only has one and a rather small one at that, so depending on the pan and the food cooking you must take care or the food directly over the induction rings will overbrown or burn. I still use it almost every day, and like most of the things about it.
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