[hammock]

>you can actually soften butter

Ooh that's a good use case. What else do you do with it?

[kbuck]

Anything dense (e.g. lasagna, meatloaf, etc.) is good for a lower power level / more time trade-off. It will end up more evenly warm without the edges exploding. I usually use power 3 or 4 for these dense dishes.