It's super sleek with no sharp angles and a bubble shape at the back that makes it look more like a sedan/coupe than an SUV (and will surely encroach on boot space, but more on that in "How Spacious is it?").
With everything so smooth and rounded it's a sophisticated and original shape that makes it stand out in a crowded market. And my test car had the Night Package ($700) which adds black exterior highlights.
Inside is designed well with the usual high quality finishes you'd expect from Mercedes, and its curvaceousness extends to the interiors, with a rounded cover over the cupholders, a rounded dash in front of the steering wheel and three large circular air vents taking centre stage. Brushed metal trims all through the interior give the whole car a premium feel. There's also ambient lighting that you can see at night which really gives the interior a spaceship-type feeling that my children thought was very special.
Interestingly, there is a vegan leather option for this model of the GLC - though my test vehicle had real leather (a $2900 option), and all GLCs get a leather-lined steering wheel.