If you are warming up stuff with cheese or other gooey substance in it, yes the product helps. When the food hits the boiling point, that cover keeps the steam from escaping. This helps to warm the cheese so it actually melts before it boils. I use one like that, or a paper plate, when microwaving burritos or chimichangas. after about half the time has expired, I throw some cheese in and cover the container. No time later, voila! Melted cheesy gnosh.
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