It fades like fook! (We are only talking about the "Special solid" Caribbean Orange).
Mine went in for an Insurance job (new N/S front wing) in February and the body shop couldn't match the colour due to the variation in fading (worse on the metal panels than the plastic).
I bet all you orange owners' GP has faded - If you open the doors and look at the shuts you can see the colour it was when it rolled off the production line. A nice deep orange that the sun hasn't bleached. The problem is it's a solid colour (with red in it) which is far more susceptible (than metallics) to sun damage.
Looked like a patchwork quilt after they finished my GPS...
After nearly 6 months of to-ing and fro-ing (and complaining!) they finally gave up trying to match it and resprayed the whole car! Result! It's PROPER orange now! (Been meaning to get some pics up actually!)