New Guy seems pretty satisfactory. He's rather chatty in an unstrident way, though a little disappointed in our obtuseness about the refrigerator and the bathtub.
Biggest negative so far is that he wants to sharpen his claws on the couch and is totally unimpressed with the scratching box. But to balance that, he is using the litter box -- with great intensity, involvement, and odor.
I think we should keep him.