I got the call last week, but just for a test drive of an S. I did my test drive a couple of days ago and it was a blast.
Regen is really awesome and I can't wait to be able to use that day-to-day.
That acceleration was amazing (from a RWD S75, no less!) and I didn't even try to floor it completely. If the Model 3 can do even close to that, I'll be quite happy. That acceleration was absolutely my favorite part of the test drive.
I tried AP on the highway and on side streets. It seemed to prefer to hug the left side of the lane (even on the screen) while I was on the highway (I stayed only in the right lane). It also tried to follow the exit once, so I got to know what that oddity is like. It was much more behaved on the slower side streets. I have a car that has a TACC/Adaptive cruise control already, so I'm used to the car doing the pedals for me, but the steering wheel moving on its own was a new sensation.
There was no attempt at an up-sell (since they can't actually "sell" in Texas), so I wasn't pestered about purchasing an S. It's a great car, but the 3 solves the problems I have with the S (high price, limited backseat headroom, too large, lacking basic car features, and huge door thickness). I still have no desire to get an S, but this test drive just got me really excited to get my 3.
For anyone else considering whether or not to do the test drive when offered, do it. It shouldn't "ruin" your current car (as long as you already have a Model 3 reservation due to come up soon) and it's a lot of fun, especially if you've never driven a Tesla before.