I have used Berge.
They were the outfit that was a central repair point for the A-arm repairs in the early days.
I deal with Josh (only) in the service department. He takes my car back, and brings it up when done. No one else drives it. When I call in, they give me a priority treatment and pretty much run on my schedule.
Like all dealers, there has been a small issue here or there, but they have done everything I needed and have been very easy to work with. All warranty items have been a no-hassle issue. Even on items where I hand them mine and do my own repair (I prefer to do my own work if possible - nobody has the same concern as when doing your own).
I have heard some good stuff (and issues, or course) about North Scottsdale, but have not used them yet. I guess I like dealing with Josh.
If you go there, tell them Larry with the white GT sent you in.