It's time to replace my wife's DD, so why not buy a cool practical vehicle.

It's a 2018 SQ5 with 14k miles, sports diff, 21" wheels and carbon inlays. It's pretty close to how I would order it. It came into service in Feb 2018, so it is an early 2018 model.

I've heard of some issues with the early cars liked failed window regulators, anything to look for?

Besides the obvious drivetrain differences, how does the SQ5 differ from the Q5? I assume, lower stiffer springs, higher rate sway bars, mag ride, bigger brakes, anything else?

What is the best size for snow tires? I'm thinking 18".