Aaah.... Now you've opened up a can of worms!

Feathers are far more forgiving of rest contact, slight brushes with a twig or something of that nature on the way to its intended target, and... they just plain look cooler! [8D](If you get barred feathers, that is... )

On the other hand, guys will complain that they create too much drag past like 50 yards and slow their arrows down.... (No concern to me; I'm not shooting at olympic distances), and you have to take an extra step to waterproof them in the event of hunting in a soaking rain.

There ya have it: Three pages of arguments boiled down to a couple paragraphs! [8D]