I wear an EXO-900 vi-his helmet and a First Gear hi-vis jacket. In my mind, you want to be in contrast to your surroundings to be noticed. More and more road crews are wearing hi-vis instead of the traditional orange. People are being conditioned to notice the hi-vis and slow down. I wish both my helmet and jacket had diagonal strips because it would contrast the horizontal and vertical lines most seen in the surroundings. Regardless of what you wear, still understand that in some circumstances, it won't matter. I got hit on July 4th, 2010 in my neighborhood. They flat out didn't look!
I've not noticed my helmet fading at all over time, but the top surfaces of my jacket have faded a little.