We say The CLS is basically a cooler E-Class, though its drive doesn't match the phenomenal looks.Performance The 3.5-litre, 5.0-litre and 5.4-litre petrols are all sufficient, with the 3.5 providing the smoothest drive. AMG model has 6.2 V8 and there's an economical but strong diesel option as well.Emissions With an average CO2 output of 260g/km and a fuel economy averaging just 28mpg, the CLS is predictably polluting and thirsty.Driving Suspension is lower and firmer than the E-Class's, from where it's sourced. As a result the drive is good and smooth enough. AMG has rougher ride still.Feel The Gearbox struggles to translate the power from the larger engines at times but there is very little in the way of noise intrusion – apart from in the AMG, where it is very much a welcome noise.Space The CLS is basically a coupe and as a result room in the back is a little cramped for adults but there is good boot space at 550 litres.Equipment Climate and cruise control, leather, CD player, electric windows and seven-speed auto box as standard. Rain-sensing wipers and 18" alloys at higher specs.Price The CLS is expensive to buy and run, but comes with strong residuals. Whether you consider it good value depends how much you want one.Quality Mercedes has decked out the CLS with unsurprisingly high-quality materials and it feels like a lot of effort has gone into making the interior as comfortable as possible.Safety Airbags, traction control, anti-whiplash headrests, flashing brake lights and intelligent seats that place the passengers in the safest position if a crash is imminent.Pros The Mercedes CLS is a beautiful car with instantly recognisable style, excellent performance and four-door, executive saloon-like space.Cons Loses a little in practicality stakes, especially if you're a six-foot tall rear passenger due to that sloping roofline.Alternatives Jaguar XK Coupe, Citroen C6