When I got my car, the dealer opted not to put on the roof rack and left the kit in the hatch. I drove for a week and decided to try it out. I mounted the roof rack and kept the cover pieces just in case. After putting on the roof rack and driving around with the sunroof open, I found it to be a bit noisy. I just took the roof rack off and I drive around with the sunroof open and I don't notice any noise. Besides, down here in So Fla, everyone has the rack on, so I like the different look form the average Joe P5 driver.
It's easy to add/remove. If you want to go totally naked, follow the thread from above to remove the gutter from the headliner. I got a bud who did it and it looks nice! I'm not going to mess with it myself, as i might get the urge to put the racks on again and put up a bike rack.
Just my 2.59 cents....