I understand the roll rate peaked at 100 deg per second. This is moderate for an air vehicle billed as highly maneuverable. Sikorsky billed the ABC rotors as being so stiff you could narrow the gap between rotors with no chance of them colliding in the extreme maneuvers that the concept was promised to be able to do.
So Nige how would you classify an aircraft that can damage itself in flight when it was not suppose to be able to, exhibiting vibration levels so high that test pilots limit the level flight speeds even in the test environment, and has so much drag that it can not even come close to the originally advertised 250 knots?