I never knew such a pan like this existed until now. This pan is not only great to warm butter, I have found it especially useful to melt chocolate. In the past, I have failed miserably when trying to melt chocolate, but now I can proudly say I can. I love how easy it makes heating up individual serving sizes. I noticed that I have to be careful to keep the heat at just the right temperature so I don't burn anything. This happened once, which made the pan hard to clean. With that being said, this pan is very useful and I feel everyone should have one in their kitchen!