I would say the major weakness with the X3 is the navigation. My 6 year old Acura RL is better. I test drove a new new Lexus GS- awesome navigation and the Mark Levinson sound is a nice upgrade. Doesn't drive as nice as my X3, not even close to a 3 or 5 series.
2014 528ix M Sport. Space Gray/Mocha Brown Nappa Leather, Anthracite Wood Trim. Packages: ACC Stop & Go + Active Driving Assistant, Driver Assistance, Driver Assistance Plus, Lighting, Luxury & Premium. Options: Paddle Shifters, H-K. Surround Sound System, Heated FS's & Power Rear Shade with Manual SS's.
2013 X3 28i M Sport. Deep Sea Blue/Sand Beige Nevada Leather, FS Wood Trim, BMW Apps, HG Rails and GY LS All Seasons. Packages: Cold, Conv, DHP, Perform, Prem, Prem Sound and Tech.