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The BMW has more horsepower. For me that is the only thing in it's favor. It is too expensive to buy, too expensive to fix, too heavy, and not that reliable. 8 speeds in the transmission of a vehicle that can maybe do 145'ish if the governor wasn't there is about 2 too many. Driving it in manual mode would have you shifting all the time. It's all about maxing out the EPA mileage cycle and overkill for actual driving.
Based on what, your personal experience? The OP is looking for people that have owned an X3 not subjective opinions. I have 108,000 on my 2011 328 sedan and it has never been in the shop for anything other than oil changes, tires, and front brakes. The front brakes were no more expensive than the rear brakes I paid for at the Mazda dealer. I have driven 8 speed newer models and had no issue with the car finding the right gear.