I've owned my 545 since Feb 2004 with no serious problems. I have had two recalls (fuel line clip and emissions) that were quickly taken care of. The only mechanical issue I have had has been the cracked headlight brackets, twice now. Early versions of the E60 were noted for software issues, particularly those cars w/ Navigation, which uses a different computer than non-Nav cars. I don't have Navigation so I have not experienced any of the gremlins that many early adopters faced. Just passed one year of driving and it is an awesome car. Obviously you've read about the controversy over the new styling, but that is a matter of personal taste, I love it. The vast majority of software issue now appear resolved. Also look closely at the Active Steering option as I never could get comfortable with it, so I ordered my car without. This option seems to be as controversial as the styling, those who have it seem to love it, but there are many like me who just never liked the feel of it. You don't indicate what you are looking at, a used car or a new one, but if it is new, I personally would be a bit careful with early Navigation equipped cars, though recent software updates seem to have solved most of those early issues.