Bought my X4 at 7,500 miles, just about to clock on to 40K and its been absolutely fine no issues. Rear tyres replaced at around 38K and front still going strong. Need nothing but regular services which I got included in my purchase for 5 years.
Agree with the comments about it being unlike the RR Evoque. Test drove both before purchase and they are very different. Suffice it to say the X4 lured me due to its exclusivity and drive style, as well as the dash layout and space in the rear.
Im very pleased with my F26 but definitely wont be changing for the G02 anytime soon!