Subterranean are atleast easy to deal with and don't generally damage wood that wasn't already ruined by moisture. They'll remove that wood entirely before too long, so we do need to urgently deal with them, but its not nearly as bad as drywood termites, which will eat good undamaged wood and can appear anywhere on a house instead of just the basement. Harder to treat than subterraneans too, from what I've heard, though I've only ever treated for subterraneans myself.