The latest generation of the Mercedes M-Class was introduced in late 2011 as Mercedes lifted its game against rivals that have emerged in the decade since it spawned this segment: the Audi Q7, Porsche Cayenne and BMW X5. The M-Class is nearly four-metres long and has a massive load area, regardless of which of model you choose. The ML 250 starts the range with a 202bhp 2.1-litre four-cylinder turbodiesel, then there's the volume-selling ML 350 with its 255bhp V6 turbodiesel. If it's power you’re after rather than efficiency, there's the ML 63 AMG complete with 518bhp 5.5-litre twin turbo V8 – the most powerful Mercedes 4x4 ever sold. All offer luxurious equipment levels, fit and finish as well as an imposing road presence.