Just returned from what was apparently the first P3 test drive at Topanga. Had the chance to make it a thorough one. Won't attempt to provide a general M3 review -- there are thousands out there -- but merely my impression of the driving difference between LR and P. Only one word: Ohholymotherofgod! Acceleration somewhere in between an S 100D and P100D ... with Model 3 handling. AWD Model 3 handling. No squirrelliness on hard launch and incredibly composed when accelerating aggressively through curves. Necessary? Lord no. The LR is plenty fast and nimble. But fun? Like mainlining endorphin. Car goes where you want, when you want ... actually the instant you even think of it. Regenerative braking definitely stronger. Things I didn't notice (although they may have been there): Rougher ride, even though these were 35-profile tires at 46 psi on 20-inch rims (vs. 45-profile, 40 psi, and 18-inch) on our 3LR. Loud front motor whine under acceleration. Wind noise. Second-generation seats a definite improvement. And, to my surprise, I liked the white seats ... material somehow seems extra buttery. Not a huge fan of the white dash panel, though. For folks who like the BMW 3/4, Audi 4/5, combination of performance and refinement, this may very well be the best car ever. Unless Tesla screws up organizationally or financially, the game is over.