I used it on my E53, and also on a 325xi. Worked well. Agree with MD's points, but the first time you use it you might want to stay off the steep hills and just find any old hill. The cruise control buttons work to adjust the 'crawling' speed. It can be slightly unnerving when you are on a very icy surface and the brakes are being dabbed left and right by the computer, but that is when the system is most valuable IMO.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue