First of all, you have to know what the 6-series is and is not. It is not a canyon-carver w/ it's porcine weight, but a GT rocket ship most comfortable near three-digit speeds on open road. It's the 2nd most depreciating car on the market, so if you find a good used example, snatch it up quick and thank the previous owner for taking the full brunt of depreciation. No problems and smooth. No car for this $ gets the nods, 2nd looks, thumbs ups, and in one case actual cheers, for it's mere presence. If you're a DIY'er, get on bimmerfest and learn the easy maintenance steps and save even more $. Note: 0-60 is nothing remarkable. 60 - 120 is absolutely frightening.
Having owned BMWs over the years, I love and expect the superior quality, safety and performance these cars always provide. When BMW came out with the 645 I fell in love with the new, bold and innovative design, but it wasn't the time to buy a new car... and there's always a reason why! When I was ready to buy the 650i had been released and I bought my beautiful Monaco blue convertible. It's far and away the best BMW I've ever owned and well worth the wait! I cannot recommend any other car more highly than this one, it's worth every bit (and more) what I paid for it.
After driving a Lexus SC430 for 6 years, the only other reasonably priced car that caught my eye was the Beemer 650i Convertible. I was sold the minute I test drove it. My biggest concern was wind noise through the soft-top. That concern evaporated at 110mph on the freeway. This car is quieter than the Lexus with a hard top!!! Secondly, the car excellerates very well. Almost as well as my '66 Big Block Vette (but it's far quieter). I do miss the 4-speed shifting, but the sport mode while in the manual shift mode makes up for the need to clutch. This car handles like a dream. Lexus, take note: When you hard steer into a corner, the tires don't even while a bit. I love this car!!!
I got my 650i convertible with most options in mid-June and it was delivered flawless and has been flawless in the first 2000 miles. The iDrive is easy to use, although boot-up sometimes takes a while. A few minutes with the manuals is worth the time. The 650 is very well balanced and after break-in seems to get better mileage and has better response. I have owned more expensive cars that do not come close to this one dynamically or stylistically . It is not the fastest car, but it is fast enough for me. Lots of compliments on the design. When compared to cars costing over $20000 more the 650 comes out on top, IMO.
This car MUST be driven to be appreciated. Once test driven, I had to purchase it. Acceleration is awsome. Dynamic stability control keeps the car perfectly level in corners, as they say, like riding on rails! And BMW quality speaks for itself! Now thinking about the M6, but that may be too much power. This car is the perfect performance luxury vehicle!