The 540iA with Sport Package is great to drive. The car is rock solid on the road, but I have had a number of parts replaced. My one gripe with the car is it sits too low to the ground. My front bumper cover and front air spoiler were torn off by objects. The car is solid to speeds up to 145 mph (yes, we drove it that fast once as per the speedometer). There is likely some small amount of speedometer error. I purchased the extended warranty, and it was a wise investment. The extended warranty cost ~$3,300, but it got me a new factory radio, radiator, radiator expansion tank, power steering pump, and several thousand dollars of replacement suspension parts (plus service).
Solid ride. Very stable.
Front air spoiler and front bumper cover sit too low to the ground. Inside door handles and cup holders are cheap.