Go for SE or Sport trim and you’ll get the softest of the two conventional suspension set-ups available. Common sense would suggest this is the better option if you want a comfortable ride, but in reality there's too much side-to-side movement along any road that isn't perfectly smooth, so your head is tossed from left to right continually. Potholes also flummox the suspension too easily, particularly when cornering forces are involved, causing the GLC to skip and shudder nervously.
The firmer sport suspension – fitted to AMG Line models – is a little less forgiving over bigger obstacles, such as speed bumps, but overall it's actually the more comfortable set-up. It brings a more controlled ride with less pitch and wallow, and more effective damping over potholes and broken surfaces. That’s true even if you choose to upgrade from the standard 19in wheels to the optional 20s.
However, it’s the air suspension that comes available as an option on all three trim levels that’s the most impressive on UK roads. We tested it on the top-of-the-range GLC 43 AMG, and despite that car coming equipped with large 19in wheels, the suspension did an impressive job of smoothing out imperfections.