I did a search here on Roof Bike Rack and got 31 hits. I posted in quite a few of them, so I will let you read about the detail there. I put pictures of my bike rack on two different vehicles in those posts.

In summary, the BMW rack is expensive, and while the lifting arm is an interesting idea, I have never struggled to lift the bikes up (including a tandem).

I recommend Thule and Yakima for crossbars, with Thule, Yakima, or ATOC bike holders. If you are not tall enough to put the bikes on the roof, carry a Rubbermaid step stool with you. Our X3 is easy, our E53 was fine, and I suspect that the E70 is just that little bit higher.

Jeff

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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