The Mercedes GLS has an impressively punchy and smooth diesel engine, and its smart interior will comfortably accommodate seven occupants, but the build quality and ride comfort disappoint for a luxury SUV of this price. The 450d makes the most sense in AMG Line Premium Plus trim.
The top-level First Class trim builds on the standard Maybach with active-body suspension, folding rear tables, a refrigerated compartment and two individual rear seats.
This uses a slightly less powerful version of the 4.0-litre V8 in the AMG GLS 63, developing 590bhp and 538lb ft of torque. This is enough for a 0-62mph time of 4.9sec.
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