Judy has a 2014 X3 with the turbocharged 4 and loves it. Great handling machine, and has three driving modes. I usually run it in the "sport" mode which is better throttle response which I love. You will not have a problem with non-responsive 4-cyl like a lot of cars. This one has guts !! Judy uses the normal mode around town and has no problem with that. There is an eco mode that shuts off the engine at stops, but we run that disabled. This is her second X3 and she is basically spoiled by BMW cars. Simply the Ultimate Driving Machine. Her mileage is around 24 city 28-31 on highway cruising. The original X3 was a non-turbo inline 6 with plenty of pep, but the turbo 4 feels a bit stronger due to the turbo and sport mode program. Benefit is that you have performance capability, as well as great economy if you use the eco-mode stuff.
I drive a 2010 X5-3.5d which is the turbodiesel inline 6. This is a beast that most people mistake for a V8. Great power, great towing capability, and is very "sporty" in performance if you put your foot in it. It also gets similar mileage to the X3 and is a great long-distance machine, 550 miles at a hop is easy.
The X-Drive 4wd system is very nice, and the automatic stability control really works. My X5 saved me a crash when I hit some oil in a two-lane turn situation with a large truck in the outside lane. I hit the oil and felt a definite yaw and slide, and simple continued to look where I wanted to be and did not touch brakes or make any gross steering inputs. The ASC could be felt doing its thing and regained traction without me sliding into the truck.
If you have a choice, get the technology package. It includes a bunch of goodies including the backup camera and a vertical view set of side cameras, and tracking HID headlights. The side cameras make parallel and backup parking very easy.
All together a great vehicle. If you wish, shoot me a PM and I would be happy to talk with you about it. Then we can put the women together and let them work it out
If you buy it you will not be disappointed in the car. Depending on your mileage, you might even save a bit of money simply leasing, and get a new one ever 3 years of so. That way you have no maintenance other than tires and wiper blades ever.