The entry-level SLK 200K makes do with a supercharged 181bhp four-cylinder engine, but it's brisk enough if you rev it hard. For more grunt, there are two V6 petrols; the 280 has a 228bhp 3.0, while the 350 has a 301bhp 3.5. If that's still not enough, the SLK55 AMG has a 5.5-litre V8 with 355bhp to call on.

The SLK is good at soaking up bumps when the roof is in place. However, there's a significant decrease in body rigidity when you drop the top, so the suspension doesn't work as effectively, and rough roads are more unsettling. It grips well through bends, but isn't as much fun as a BMW Z4 or Porsche Boxster because the steering is rather vague.

The SLK is impressively quiet when the roof is in place, with little wind or road noise to irritate. There's not too much buffeting with the roof down either, especially with the optional wind-blocker in place. The 200K's engine is wheezy when worked, but the larger-engined models are generally easy on the ear.

You'll pay handsomely to own an SLK – marginally more than you would for an Audi TT Roadster. The Merc’s continuing desirability means that it's a safe place to put your money, though, because resale values are strong. Running costs range from reasonable for the 200K to sky-high for the 55 AMG.

The SLK's cabin is neatly styled and solidly constructed, and most of the materials feel worthy of its hefty price tag. The controls have a pleasingly solid feel, although some of the switchgear is shared with Mercedes' cheaper models. Mechanically, Mercs tend to be tough, although the complex electrics on some of its models have developed faults.

A number of electronic driver aids including stability control should help you to avoid accidents, but four airbags and a pair of rollover hoops should help you if you can't. However, deadlocks are a serious omission from the security equipment list.

The seat cushions could do with more lateral support, but there's lots of adjustment to help you get comfortable. The dash layout is straightforward, too, with simple rotary air-con dials and clearly labelled stereo buttons. Only the optional steering wheel-mounted buttons for the auto let the side down, because they're awkwardly placed behind the spokes.

Two large adults will fit comfortably in the cabin and there are plenty of storage cubby-holes for their clutter. The boot provides more space than many roadsters, and when the roof is up, you can fold away the roof's recess to create an even deeper area. The roof itself folds down in 22 seconds and can be operated remotely from the key plipper.

Every SLK comes with climate control, cruise control, electric front windows, alloy wheels and a CD player, while the 55 AMG has leather upholstery and metallic paint. However, Mercedes' 'Airscarf' system, which blasts hot air from behind the head restraints to keep you warm when the roof is down, costs extra.