I received my performance model s on Saturday. It's still cold where i am, but i have occasionally "hit it" on some straight aways. I remember literally being scared when i did this in the test drive car... it pulled that hard - plus i did hear the high pitch whine under hard acceleration. I have none of this with my Model S Performance. I'd actually say unimpressed (to myself) - which sounds ridiculous because a lot of people have been talking about this aspect, in a positive way. I wonder if i'm missing something? "Sport Mode" - lol. To be fair i haven't read all through the manuals, but wondered if anyone else had an opinion.