I only kept my 159 for a couple of years - and that was 3 years ago. Purchased new, I liked the outside look of the car but it just wasn't refined enough. I had some good drives in it, had reasonable economy, but it wasn't nearly as much fun to drive as the 156 I'd owned earlier. Mine had the noise from the front offside drive shaft, needed a new windscreen wiper assembly and motor, and had to have a new rear screen. As it left me, the clutch was beginning to slip badly at 40,000 miles and the gearbox was getting noisier. In spite of the looks it was really just a normal family plodder and the competition had just caught up with it. Very little Alfa sportiness left in it, maybe just a distant echo in there somewhere.
Since then I've had two diesel Mondeos, an A5 a Fiat 500 and an old Volvo S80. 4 of those were smoother and more refined than the 159 whilst giving nothing away in performance, 4 of them handled as well, if not better and one of them was, and still is, just a lot more fun.
I won't be able to afford a Giulia when it finally arrives so its looking like no more Alfas for me, unless I find a nice 1300 GT Junior at a bargain price. I may yet look for a Series 2 156 or even a 166.