The operation is perfect.
The white cap to diffuse the light seems an indispensable accessory for the 430 ex II is not equipped with a white card.
well it diffuses light and reduces shadows especially when there are white ceilings, it also warms the atmosphere a bit.
The cap does better than the white card of 580 ex so do not need to miss out, it's lightweight and discreet.
This is a great flash.