I wanted them for storing butter.  We take the cubes out of the freezer and keep them at room temperature for ease of spreading. These bowls are 1 cup bowls and I thought they would hold two 1/2 cup cubes.  But the lids fit inside just enough so they don't quite hold that much.  They would be great for holding small leftovers and if you want to reheat they could go in the microwave.  I am still using them for butter dishes and I'm glad I ordered them.  

Pros: You can't go wrong with Pyrex.  The lids fit great and the dishes can be used in the microwave.
Cons: Even though they say they are 1 cup they don't quite hold that much.