Parkers overall rating: 4.5 out of 5 4.5

From launch two engines will power the 6-Series Convertible. The top-of-the-range 650i V8 has an output of 407bhp with 600Nm of pulling power. The sprint from zero to 62mph will take 5 seconds and it has an electronically limited top speed of 155mph. This model feels raw - the engine gives a pleasing burble and it is stunningly quick, propelling you along with great gusto.

The less powerful six-cylinder 640i is a little slower but it feels more usable as a daily driver. It has an output of 320bhp and 450Nm of pulling power. On the benchmark sprint it will get from zero to 62mph in 5.7 seconds and is also limited to a top speed of 155mph. Both engines are mated to an eight-speed automatic Steptronic gearbox. If you’re not worried about losing 0.7 seconds to reach 62mph and prefer comfort over power, then the 640i is certainly the car to go for.

What you lose in terms of performance you will make up in fuel economy and CO2 emissions, plus it still has the edge over some of the competition. Compare it against the Mercedes-Benz SL 350 and you’ll see that the ‘Beemer’ is quicker on the benchmark sprint by 0.5 of a second and has 5bhp more.

Outstanding, agile and responsive, the BMW boffins have greatly improved the 6-Series Convertible. This is largely due to the all-new chassis and the increased torsional rigidity – up by 50% from the previous model. To suit your driving style Dynamic Control now comes as standard. This allows the driver to adjust the settings of the car from Comfort, Normal, Sport and Sport+ mode.

By alternating the controls this allows the responsiveness from the gearbox, steering and throttle to be changed to suit your driving style. Normally a convertible loses its structural rigidity and some of its handling ability but the 6-Series has not been blighted with this trait. Roof up or down the 6-Series will make you smile when cornering. It is brilliantly set up and has excellent turn-in when driving on challenging B-roads.

Undulating surfaces will not pose too much of a problem as the suspension soaks up lumps and bumps that get in its way. The first-class handling and vibration-free structure all result in making the 6-Series Convertible a sporty yet comfortable cruiser. Optional Integral Active Steering system is available on this 6-Series. The system combines Active Steering for the front axle with a steering rear axle.

This allows the steering angle and power assistance to be controlled at both the front and the rear with the help of electric motors. At speeds of up to 37mph the rear wheels turn in the opposite direction to the front reducing the car’s turning circle by 0.5metres. Above this speed the wheels turn the same way for a more composed high speed ride.