I don't have an X1 yet, but so far I have only heard good things about it off the road. Sure, you're limited by the the kind of tires you have, but the traction control gets the job done perfectly. I read that unlike many systems, BMW sends and adjusts power to all four wheels immediately and you won't have a situation when the wheel without traction gets all the power and vice versa, plus the gearbox and differential are fine with lots of wheel spin, unlike double-clutch systems. So it's going to go anywhere the ground clearance and the front overhang will allow.
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