I have owned my Thule Sonic 635S (HumblePower ~$500 .. free shipping) for about two weeks now. Last week I loaded it up with hockey equipment for a 350 mile trip to Rochester, NY. The Sonic was very quiet, and I was convinced that Thule designed the box for fuel efficiency, with the side benefit of low low wind noise. The quality and fit was similar to my son's Atlantis 1600. Since I drive many miles, just a 2% gain in fuel efficiency over the Atlantis will pay off in just a year or two.
Pros: Quiet, nice finish, one touch operation
Cons: A bit pricey