There is a slight problem with tramlining and Active Steering, and this is probably my only complaint about Active Steering on our 325i.

If you hold the steering wheel firm and resist the tendency for the low-profile tires to tramline, the Active Steering also compensates for the uneven road surface. So it's kind of doing double duty, so it can be very creepy driving on uneven road surfaces. Sometimes the steering wheel will want to tug hard left/right, or the vehicle will veer left/right by itself although you have no actual steering input.

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2014 Mazda 3 GT: Ø Consumption: (click for details)