Well I'll add my .02. I've seen the Line-X in blue on one of VX brothers here at the Mohegan sun and must say it is tight! I also know the Rickster has his cladding painted Black. I would say that it all comes down to 2 things.
1. Persoanl taste. and 2. if you are gonna paint the cladding PPG had some specs about how to prep your cladding the right way for paint.