Not true for the MY 2014 X3s, both the video output and interface have been disabled. So the only benefit now is the external antenna but depending on where the OP lives that may not be necessary.
Originally Posted by 02420X3
The only thing that the cradle will get you is video on the 4S (but not on the 5), a different iTunes interface, and allegedly access to an antenna that will give you better signal strength.
2014 X3 28i - Deep Sea Blue Metallic - Black 'Nevada' Leather - Brushed Aluminum - Cold Weather - Driver Assistance with Top View - Lighting - Premium - Technology - Satin Aluminum Roof rails - Rear manual side window shades