We say Hmm. The R-Class offers four-wheel drive, six-seats and lots of space. Very niche and very odd - if capable enough.Performance The R-Class comes with a choice of 3.5-litre, 5.0-litre V6 and V8s engines and all are strong and refined. The diesel 3.0-litre adds economy to this mix. There’s plenty of power there for motorway driving.Emissions The diesel is capable of 201g/km of CO2 emissions but that is as good as it gets. At around 30mpg on average, the R-Class is not cheap to run.Driving The Mercedes R-Class delivers a smooth ride and enough power to be comfortable on the motorway. Around town it can be a little clumsy and its large dimensions make it difficult to drive in built-up areas.Feel All the engines available with the R-Class are quiet, making for a superb cruiser and a comfortable ride for driver and passengers.Space Long-wheel base provides space for six and an ample boot. SWB model is a little cramped but the seats fold to open up boot space.Equipment Alloys, cruise control, automatic headlights and wipers are standard, but it's higher specs beyond that.Price Running costs will be dear, with the diesels off-setting expense slightly. Residuals should be good, but it's undeniably an expensive option for a people carrier. Perhaps one for businesses.Quality The Mercedes R-Class offers superb quality inside and out. Well-built using premium materials, there’s no denying the R-Class is a sophisticated way to travel.Safety ABS, brake assist, four-wheel traction control, stability programme, six airbags are all included as standard. No problems here.Pros The R-Class is big and practical without skimping on luxury. Ideal for as an upmarket people carrier.Cons It is expensive and higher specification models add even more to the price. Running costs are high.Alternatives Land Rover Discovery