I drove the Volvo XC60, the Audi Q5, the VW Toureg. None handled as well, or had the build quality of the Mercedes. Oddly enough, the Mercedes was the lowest price. I have had my GLK for 2 weeks. It is a pleasure to drive, and, unlike some other reviewers, I do not have any complaints about the gas mileage (I am getting around 20mpg). My previous car (and Audi A4) only got 22. I would highly recommend this vehicle.
How it handles on the road: tight steering, easy on the bumps.
A cargo cover for the way-back would be nice (it does not come with one in the US, although I think it does in Canada). But really nothing to complain about.