I used to live in Albany and had the PS A/S on my M3. They worked quite well in light to medium snow. If you live in areas where the roads and consistently plowed, the A/S are a good compromise between performance and grip in snow.
Of course, it is a compromise. Don't expect the grip of summer tires and the traction of full blown snow tires.
E92 M3 DCT - AiM EVO4 Data Logger / AiM SmartyCam HD / KW Competition 2-Way / OMP ARS Racing Seats / Brembo GT 365 / Pagid Yellow RS-29 / Rear Seats Delete