I am sure that you will love the car. I had running boards on my E70 and I did not find them to be very useful. I am over 6' so there is no issue getting in or out of an X. What I did find was that in winter my pant leg would rub on the running board and I would get salt stains. So they were a net negative for me, but I had to order them to get the skibag.

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07 X5 E70 4.8i
04 Z4 E85 3.0