I have a SM F-18 in Blue Angels colours. How well you can see it depends on the lighting. I agree with Enrique, on bright sunny days it is no problem, the orientation is clear enough. However, on grey cloudy days it is quite difficult to see the orientation of the model. The yellow shows up well on the spine, but at any distance the yellow wing tips hardly show up at all, so keep it close. Sadly, living in England we have lots of these days[&o], so I am planning to change the scheme to one of the more colourful Canadian schemes.
In the meantime I am just finishing my SM F18E Superhornet, and this will be lit up like a Christmas tree[8D].
Regards,

John