The true Polestar story starts with the 3. Based on the Volvo EX90 but sharing no visible panels inside or out, this big mid-sized SUV EV is the Chinese-owned Swedish brand's tilt at sportier alternatives like the BMW iX and Porsche Cayenne, and is priced accordingly. Key goals included striking design, leading comfort and driver-focused dynamics, in a safe, family-focused SUV. Does the 3 succeed?