Originally Posted By: greenjp
A little late on this reply, but I just finished a trip with my new Yakima Skybox 16. I had previously borrowed a friend's Thule Ascent 1600, which is their comparable product. I bought the Yakima because it was a little bit cheaper than the Thule, and seems to have a bit nicer construction. $390 delivered from Amazon.
The main thing you get when buying a Thule or Yakima over the Sears or other off brands seems to be the fastening system. On the cheaper products it's basically a u-bolt with nuts connection to the roof rails. The Thule and Yakima boxes (at least the mid level and up models) have no-tool required connections. You can install and remove them in a couple of minutes.
There is a mpg hit. On this trip to the Outer Banks and back my Saab 9-5 Aero has gotten 31-32 mpg without the box, and ~28 with it. Considering how easy it is to take the thing on and off (ie I never drive around with it if I don't need it) a 10% mileage hit for almost double the cargo space is a pretty good tradeoff. Certainly a better option than a bigger vehicle.
jeff
Thanks, the Yakima Skybox 15 is on my short list.