I traded my 2013 328i for the 428i GC. I've had about three months to evaluate the car, and, so far, so good. It looks gorgeous from any angle. The turbocharged 4 delivers generous power at any RPM. The car handles curves and turns with grace. Cargo capacity is great with the hatchback design.
Buy all the options except the winter package unless you needed it, same for the x drive. The best BMW, including safety, on the road. The M upgrade is worth the price. The 19" run flats are quiet and smooth. Best car in design and quality I have ever owned. ( new cars every 2 years since 1962!). The room in the back is spectacular. The 6 cylinder engine is very quiet, smooth and powerful. The design is a head turner. After a year of ownership I am really in love with my Grandcoupe. For the first time, I'm Going to keep this car longer than 2 years.
Even in comfort mode this car wants to run. If your not watchingtheguages it hits 65 and above quickly. Best 0-60 time was 4.3. Triple digits can be reached safely with little effort. Average gas mileage on 2000 mile trip at 70+ was 33. Around town in Econ about 27. Great dealer service. This was a fully equipped every option except the head light package. Extremely driver friendly and draws attention. Plenty of cargo room for long trips. Last trip was 5000 miles 30 days.
After going through the various drive modes (Eco, Comf, Sport, Sport Plus), and the transmission options, (Drive, Sport, Manual), I discovered a dedicated Launch Mode indicated on the instrument panel. It's effective and cuts nearly a full second from acceleration times across the board without wheelspin. Also, I discovered the transmission short shifts in Drive in modes other than Sport or Sport Plus where it will upshift at the indicated redline rather than 500 rpm shy as in other modes. It also will hold gears (without upshifting) in Sport or Sport Plus. All that all said, what an engine! This should in no way be considered a consolation engine. There's plenty of grunt down low in the rev range and exhilarating power as the tachometer swings up toward the redline. Strange how in this application (4-door 428), it lacks the raspy intake/exhaust that the 2-door 428i had. Also, it's a few tenths slower across the board, but only 138 pounds (as tested) heavier.
Reasonably short and consistent stopping distances, near-zero reduction in effectiveness and high-thermal capacity. Modest nose dive but no wander or wiggle under full-panic stop simulation.
In contrast to the two-door 428i Coupe that was overflowing with confidence AND predictable handling at the limit, the four-door Gran Coupe matches the confidence, but lacks the predictability. I found I was "chasing" the car's responses rather than flowing with them. Steering weight was appropriate, response was crisp, but what the car did thereafter was not constant from cone to cone. Also, I found the throttle response to be less linear and more apt to surge which also made the car less predictable.