My 535 has been rock solid. I had it in to the indy for a state inspection, and he had 3 760s there, and an E39 that I was looking over. His lead mechanic was elbow deep in the 760. 'Nice, powerful car' says me. 'Yeah, but they are full of problems. I wouldn't take one as a gift'. "What about my car?", I said. He said "I would take it in a heartbeat, those things are solid".
When I paid for the inspection, the owner of the shop (it is just him, his lead mechanic, and a C mechanic, and they all work) said "I saw you looking at my 540, it is the perfect size, and an overall great car." "What if it crapped out on you?", I asked. Then I would get your car, the 535, but the 2009 or 10. If I'm gonna get that car, may as well get the updated iDrive."