I had the RRS 2.7HSE, but now have the X6 3.5, Differences, BMW works every time, Much faster, boot same size just not the height, BMW sat nav much newer but not as easy to use as the RRS, find the x6 more comfortable to drive, RRS was always breaking down.

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X5 - 4.4i Sport In Sterling Grey, Sold June 07
Range Rover Sport TDV6 2.7 - Sold April 09

X6 - 35d Red