The BMW 6 SERIES (2004-07) 645CI 2DR CONVERTIBLE 4.4 SMG AUTO is a large, premium four-seat convertible, aimed at buyers seeking a luxurious open-top grand tourer rather than an everyday family hatchback. In the UK used market it offers distinctive BMW styling and powerful V8 character, sitting above ordinary convertibles in comfort and presence. mycarcheck.com has recorded 1,804 checks covering 511 different VINs, a substantial sample for this particular version. Its data shows an average private-sale valuation of £3,500, recorded mileage of 103,000 miles and almost seven previous keepers; average annual mileage is relatively modest at 6,000 miles. This 645Ci suits couples or enthusiasts wanting long-distance trips and sunny weekend drives, not budget commuting or family duties. The folding roof, refined cabin and performance make it more special than rivals such as the Mercedes-Benz CLK, though running costs and age-related upkeep deserve careful checking. Its appeal is effortless open-air travel.