"For this sort of thing, I'd need to do some testing. I've been reluctant to rely on the BCE alone," 9S admits, because the strange mixture of magic and technology strikes him as questionable at best. The technology COST employs without it seems inferior to his own era, even his own design, and it leaves him unsure what to make of it.

Assuming Henry has been here longer, perhaps he'd have better perspective. "Do you consider it reliable?"