I've not experienced many problems. Since I've had it, the biggest has been the fuel pump needing to be replaced at about 80,000 miles. No other problems.
Great interior, options, performance, acceleration, gas mileage, looks. I love it!! If you get one, don't be afraid to use it like it's meant to be used. So what if it's a Mercedes. It's born to work and play. That's what they designed it for. To do so in comfort and it does it's job well.
You seem to be one of the lucky ones. Please update here. I love the SUV and would love to purchase one, but am afraid that it will really cost me. Please update.