Four days in, the odor is developing and to me it smells dead-on for swine. However stereotypically repugnant that is, it is less offensive to me than the rancid mouse urine smell.
They are also just endearingly curious. Everytime I go in the room where they are, they rush over to the side of the cage. They have trained me to offer them small treats, which they snatch from my hands and then quarrel over. They are so demanding...they recognize me, and want to interact...it's completely different from the mice who after months of daily contact still bolt and won't take treats from me. Even if they never produce, they are pretty nifty pets.