I am currently driving a 530i. It is very reliable car and so far nothing has been changed or broken. Excellent handling and comfort. I love the car and every time I drive it, it is truly a superb experience. I am a one happy owner. Of course there is still a room for improvement ... M5.
iDrive...yes I like it, I cannot understand why many people complain about it. It is simple to operate. I do not have to even look at the display. Rear wheel drive (racing abilities), of course not in the snow, I am not crazy.
The built quality of interior features corresponds to its class. Overall everything is fine.