I used the microwave in several stages - added water and stirred back in to disperse the heat and moisture evenly.
I know lots of folks insist using a microwave is not "real" cooking, that they are useless and take up otherwise precious counter or storage space, blah blah blah... In a situation such as this where I had something potentially scorchable to reheat and only an electric rangetop (as opposed to gas where I can control the heat instantly) to use, the microwave is a dish saver.
I thought the sauce was just the teensiest bit grainy when reheated but it also sat in the refrigerator longer than I would have let it except we were out of town. If reused within a day or two I believe it would not lose anything in the way of taste or texture.Final verdict? The Barilla US style macaroni and cheese dish is a winner. It eats well, reheats reasonably, and was quick and easy to prepare. Give it a try if you are craving something delicious and want a compromise between the blue box or spending two hours waiting for your macaroni and cheese.