I used to drive a BMW 650i. Such an amazing car but used to visit the garage every few months. And I heard from my service advisor that X5s and X6s are the ones who visit them the most.
@Gaurav, you are spot on here. I have had terrible experience with these so called "specialists" in Sharjah who can do wonders for quarter the price. But the price which I had to pay was my Range Rover Vogue HSE. Couldn't even recover my investment on that car.
I honestly believe Mercedes are far better when it comes to reliability and I have an eye on it as my next car.