I've had mine for a week now and I love it! I'm taking the long route to work just to drive it.
I got mine with the std 17" Monzas, front and back parking sensors and the RCD510. I'm love the feel of the car on the road and really looking forward to getting it run in, so that I can turn it loose. And that note from the engine/exhaust brings a smile to my face.
In terms of build quality, I think it's pretty good after my Alfa GT (which I loved and had no problems with in 3 yrs of owning her) but I suppose everything is relative.
I originally had the Monza Shadows spec'd but cancelled them with a few weeks to go. They look fantastic, but I didn't think I could live with the hassle. I had 18" on the Alfa and they made the ride a bit "jittery", which was another consideration. After cancelling, the dealer said he could understand why as they were finding getting refurbs done was a nightmare.
I don't think I would spec anything else, maybe the Winter Pack. I would certainly buy it again, but for me ownership has been short