I'm picking up my X3 on Friday. I have a 4S and the snap-in adapter. I'll let you know how it works.
2015 X3 xdrive28d
Black Sapphire Metallic/Black Nevada/xLine, Cold Weather, DHP, DA, DA+ w/ACC, Lighting, Premium, NAV, HK Audio, Parking Assistant, Enhanced BT
Previous BMWs: 2000 528i, 2003 540i, 2007 335i Sedan, 2009 335i Sedan, 2012 X3 xDrive35i