A new look and new name, but Mercedes’ hulking seven-seater lags behind the competition.

WHAT IS IT? An updated version of Mercedes-Benz’s full-size, seven-seat SUV, previously known as the GL. Now called GLS because it is S-Class size – similarly, the GLE is E-Class size and the GLC is C-Class size – this mild update brings styling tweaks front and rear, minor drivetrain changes and an upgraded interior.

WHY WE’RE DRIVING IT To see if these updates can transform the GLS into a genuine rival for newer and cheaper seven-seat rivals such as the Audi Q7 and Volvo XC90.

MAIN RIVALS Audi Q7, Infiniti QX80, Lexus LX, Mercedes G-Wagon, Range Rover, Volvo XC90

Mercedes -Benz -GLS-driving -rear

PLUS: Great drivetrains; imposing looks; interior space; sound and power of the AMG 63 version MINUS: Mighty big; mighty heavy; expensive; dated interior; dynamics

THE WHEELS REVIEW DRIVING a GLS delivers a sensation that only very tall and muscular people must experience – you lord over almost everything else. And it’s not a friendly lording, either, like you might receive from a gentle giant, but an aggressive one that shouts, “Get out of my way”.

A big part of this is down to the GLS’s colossal, US-friendly size, backed up by design tweaks that now turn the aggression up to 11.

Mercedes -Benz -GLS-front

The update also brings a new name. Previously called GL, Merc’s biggest SUV is now known as GLS, reflecting that it’s S-Class size (just as the GLE is E-Class size, the GLC is C-Class size and so on).

There are mechanical changes, too. Non-AMG variants score Merc’s smooth-shifting nine-speed automatic, there are slight power increases for the 500 and 63, and the air suspension has been fettled to improve ride comfort and handling. There’s even the option of an Active Curve System (standard on 350d Sport, 500 and 63) to reduce bodyroll when the road gets twisty.

Mercedes -Benz -GLS-side

Things improve in models fitted with the active anti-rollbar system, but there’s still no escaping the vehicle’s size and weight. The ride has a nice suppleness but doesn’t deliver the pillowiness you might expect.

Inside, there’s a new instrument cluster, new steering wheel, redesigned centre console and larger 8.0-inch tablet-style central screen running Merc’s latest infotainment system, but while the overall ambience is suitably luxurious, it lacks style and elegance.

Mercedes -Benz -GLS-interior.

So the GLS is practical, enormous and comfortable, but can’t match newer – and admittedly slightly smaller – rivals like the Audi Q7 or Volvo XC90 for dynamics, interior opulence or value (thanks to a higher starting price of $116,900). It’s a welcome improvement, but the GLS lacks the luxury and execution we’ve come to expect from the three-pointed star.

Looks without the thirst

If you want the aggressive AMG look without the inevitable AMG thirst, Mercedes now offers a new Sport pack for the entry-level GLS 350d. At $135,900 ($19,000 more than the regular 350d), the 350d Sport adds the active anti-roll bar system, an AMG body kit and leather interior, larger 21-inch wheels, tyre-pressure monitoring and metallic paint. Every GLS can also be optioned with an Off-Road Engineering package for $3600 that adds a low-range gearbox and centre diff lock, increased ground clearance and a 600mm fording depth.

SPECS Model: Mercedes-Benz GLS 500 Engine: 4663cc V8 (90°), dohc, 32v, twin-turbo Power: 335kW @ 5250-5500rpm Torque: 700Nm @ 1800-4000rpm Transmission: 9-speed automatic Weight: 2445kg 0-100km/h: 5.3sec (claimed) Fuel economy: 10.9L/100km Price: $161,900 On sale: Now