It's not so bad to keep clean. You just need to go over it with a decent leather conditioner every 1-2 weeks and the alcantara is synthetic so you can febreeze it if the side panels get soiled. The color is more of a off white and looks way better than that nasty light grey silly putty color that so many companies use for their interiors.
The frost interior is the best combo. What's nice is that the carpet is still black. I never understood those vehicles that had light grey carpet or beige color carpet. Now that would look like crap in a couple of years.
Black would hide stains better, but I don't plan on eating a wet burrito in my Z nor a Cherry slurpee.