Insurance Group: 50
MPG: 35.8
CO2: 185
0-62 Mph: 5.5 secs
BHP: 320 BHP
Range: 551 miles
PROS: Great performance, good looks, impressive level of standard kit
CONS: Very expensive to run. The M Sport trim is much more expensive than the SE trim, but offers few improvements.
The 640i M Sport's straight-six engine develops 320bhp and 332lb-ft of torque. This means that 0-62mph takes a swift 5.7 seconds and the 640i has to be electronically limited to 155mph.
However, the 640i feels very heavy and cumbersome - it is not a sports car. The driver feels disconnected from the driving experience and although this makes for a very comfortable ride, some drivers may bemoan the lack of driving feel.
Wind and road noise are well hushed and the engine is barely audible in the cabin.
The 6 Series is much better looking than its predecessor. Gone are the awkward angles of the old car - the new model looks altogether more understated and handsome.
The iDrive system is also much improved, offering greater usability.
The M Sport convertible comes with heated leather seats, metallic paint, power steering, stability control, cruise control, climate control, alloy wheels, stereo, MP3 connectivity, rear parking sensors, satellite navigation and Bluetooth as standard.
Whilst there is plenty of space up front in the 6 Series Convertible, the rear seats are a little cramped and are only suitable for children. For the class, the boot is fairly sizeable with 300 litres on offer with the roof up.
BMW have a very good track record when it comes to reliability and the 6 Series Convertible is supplied with an unlimited three year warranty.
Although Euro NCAP have yet to crash a 6 Series, the car should be very safe and is likely to score the full five stars.
The 640i M Sport costs £70,110, making it one of the cheaper 6 Series Convertibles.
Running costs will also be a little steep - you'll get 35.8mpg on the combined cycle and CO2 emissions of 185g/km put the 640i under VED band I.
However, the BMW badge is highly desirable and the 6 Series benefits from extremely strong resale values.
The 640i has a fantastic engine and astonishing performance credentials. It's also much better looking than the old 6 Series and has a very comfortable ride. However, it's pricey and the running co...
The 650i SE is a fantastic car offering electrifying performance and unrivalled interior quality. It's not the most involving car to drive, however, and it won't be cheap to run.
The 650i M Sport is a very fast and luxurious coupe. With dazzling performance and a luxurious interior, it really is a superb car to drive. However, the whole driving experience feels a little dis...
The 640i is a good looking drop-top long distance cruiser, offering great levels of performance and a luxurious interior. However, it is very expensive to run and the rear seats are only suitable f...
The 650i M Sport offers impressive performance credentials and an almost unrivalled amount of interior luxury. However, the running costs are very high and the handling isn't as good as it could be...
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