When I bought the M3P+, I was cross shopping and driving several cars. I drove the Gulia, an M340i XDrive, a souped up S4 (with pully and tune). I beat the hell out of all of those cars during test drives. I have a NB miata with a highly tuned suspension on 245 tires as my play car (I run in STR class autocross). I also drove a couple Corvettes at autocrosses, an M2, and probably a few others I can't remember. I have owned and autocrossed a Neon SRT-4, 993 Porsche, a JCW Mini Cooper, E46 M3, E90 M3, and even once a Prius!
When I was shopping, my impressions were: It accelerates like a Corvette, it handles like an M340i xDrive, and it is numb like an S4.
Having had the car for over a year now, I have never autocrossed it, so, no update there. Every morning, I walk past the STR Miata and take the Tesla nearly every time - because when I am going to work, I want comfort and composure and relaxation. The Tesla has all of that, and if I get too tired of traffic, I kick in autopilot and relax some more. Then, when it is time to exit, I hit the cloverleaf with agression and have some fun.