Gas mileage is horrendous, especially in city driving and stop and go....and I also have the M3 which is kind of thirsty. But that is my only complain besides the fact that your wheel arches get lots of stone chips which is a common issue. I also crossed shopped with cayenne and Q7 and GL but the size of this SAV is perfect and we have done 1000 mile road trips with the trunk fully loaded ( beach, skiing, etc....) as a Family of four. The interior is well laid out and the amenities are plenty, i recommend full leather unless you have a black interior (sakhir orange full leather with piano trim in my case looks sick), it makes this SAV feel much more luxurious. Love the heads up display also. I also like the exterior look with a sleeker front a la x6m and a more menacing stance and back view.......You may need a set winter wheels and tires if you drive it all year or switch to all season rubber where you are....
Love the quote from other posters...most unpractical practical SUV!