Lots of brethren reheat in vac bags in boiling water. If its just refrigerated i like to put the slices in simmering broth. The broth gets better each time.
I did a packer and a pork shoulder today for dinner tomorrow night. I will be reheating the whole kit and caboodle in a low oven for a few hours tomorrow.
It's good cold. If just a couple slices for a sammy, microwave works for me. If reheating to feed others, boil in bag method or reheat in the oven with foil and a little broth.