For my 2013 X3, I got the Thule Aeroblade Edge system,
http://www.thule.com/en-us/us/produc...7501-_-1679968
along with the Thule Circuit 526 Bike Carriers - recommended by my LBS as one of the strongest and most aerodynamic.
The entire setup is easy on and off. And absolute silence when driving, unless I'm carrying my bike, then it's the bike making the wind roar.
Had Yakima for my X5, much happier with this Thule setup and the look is even more integrated looking than the BMW podiums, IMHO.