Our 3-week old 90D is in the shop for FWD alignment issues, so I have an early VIN (~1400) X P90D loaner. Some observations: The P90D is less floaty than our 90D over uneven roads. The P90D does not impact as sharply over rough roads (shallow potholes, expansion joints, etc.), unlike our 90D that rides borderline harsh. The P90D has more steering feel and seems more direct and responsive. The steering wheel also rotates through its travel more smoothly. The P90D has more linear brake pedal travel, with no "dead zone" at the top of pedal travel. Braking strength is determined more by pressure than distance. It feels really, really nice. Our car and the loaner both have 22" wheels with Goodyear Eagle F1 summer tires. Both car's suspensions are set to always be in low. I thought P models only add a larger rear motor, different battery fuses, and Brembo brakes. So, I expected item #4 above (brake feel), but not the rest. Does anyone know if the P models have a different calibration for the air springs/dampers and steering rack? The P feels like a proper sports SUV and is more fun to drive. I don't feel the same way about our 90D. It's not just the power difference, it's the little things mentioned above which seem to add up to a more engaging drive. For those of you who upgraded from a non-P to a P (or test drove both), did you observe similar differences?