Well, it's not called "insane" mode for nothin'! I recently got my first ride in a P85D courtesy of the Kansas City Tesla store. As the test driver accelerated, I got this sensation -- as presumably the blood was leaving my frontal lobe -- kind of like I might pass out. I've never had that happen in a vehicle before, and I like fast cars and have owned a few (no supercars, but things like a 2011 Mustang GT with the DOHC 400+ HP Ti-VCT V8). It is truly insane. If you are considering a P85D and have never ridden in one, I recommend getting a test ride (I doubt they will let you test drive a car that fast, but I'm sure they will offer rides). You may discover, much like me, that for the first time ever, you don't necessarily want the fastest model available. Equally impressive was the traction, cornering, and breaking. The traction control never broke the tires loose and never suddenly dropped power at the limit either (something I have experienced in some traction control equipped cars). Anyone who nay says the performance Model S at this point is just trolling. It's a $&#$ race car with seating for 5...or even 7...and luggage.