At one point the rainfly came unattached at a corner, but after a member of the testing group re-secured it with the provided velcro tabs (which I forgot to do during the initial setup), it wasn’t a problem.
Despite the strong winds and intermittent rain that struck during testing, the Copper Canyon LX8 bounced back quickly without damaging the fiberglass poles. At one point the rainfly came unattached at a corner, but after a member of the testing group re-secured it with the provided velcro tabs (which I forgot to do during the initial setup), it wasn’t a problem. And the rainfly turned out to be plenty of protection against overnight rain once the windows were zippered up.