I have always liked the black dust caps on the white drivers - the traditional look that immediately separates them from the majority of speakers/competition. There is a lot of brand recognition in the classic look of the drivers.
Although I've never given much thought to the dust caps, I'd still have to agree here; they are very distinctive looking. I found that the Axiom driver really stood out (to me anyways) in their banner ads. They caught my eye both before and after I became an Axiom follower. Not sure a silver capless driver would've had the same effect. Driver appearance would never be a deciding factor for me in terms of speaker purchases, but it can get one's attention if it is distinctive enough.
