The Mercedes M-Class is currently in its third generation, having been one of the first premium SUVs, which inspired the likes of the Audi Q7, Porsche Cayenne and BMW X5 when it first appeared on the market. The latest model has bigger dimensions than ever before, being nearly four-metres long and sporting a massive load area no matter which model you choose. The M-Class comes in three main specifications – entry-level SE, mid-spec AMG Sport and top-of-the-range AMG. The ML 250 starts the range with a 202bhp 2.1-litre four-cylinder turbodiesel, then there's the big-selling ML 350 with its 255bhp V6 turbodiesel, which is fitted with Mercedes’ BlueTEC technology and is the car we’d recommend as the best blend of everything that's good about this car. If it's speed that you’re after rather than efficiency, however, the ML 63 AMG is a real performance petrol car, complete with 518bhp 5.5-litre twin-turbo V8 – which is, in fact, the most powerful Mercedes 4x4 ever sold in the UK. All versions are well stocked with luxurious equipment and accessory levels, and superb fit and finish as well. On top of that, it's quite an intimidating presence on the road, if you’re after some real visual impact.