From our experience, my wife and I, it depends on the sales person.
We picked up our early reservation X from Westmont, no real interaction with the sales staff there at that time.
With our first S, I found an inventory one that matched our needs at Highland Park so my wife went up there to check it out. First sales person she approached (older balding gentleman) was rude and didn't give her the time of day. Basically told her that he did not have time to "find" the inventory vehicle. She called me and was annoyed to say the least, especially since our 4 year old was with her, but I asked her to find another sales person... and she did. Steve (who no longer is at Highland Park, but now at Westmont) was courteous and immediately found the vehicle and brought it up to the door for her to look at. Also kindly showed our daughter "her" Model S (Radio Flyer version). Steve also offered us a "deal" we couldn't refuse (it was close to the end of the quarter), so less than 24 hours later, I made the reservation (sight unseen by myself but I trusted her judgement on the Titanium paint).
So a few days later, we go to pick up the first S, as this was our second Tesla, the walk-through went quickly. There was some glue residue from the shipping masks, so the porters came over again to polish it off and during this time the first salesman my wife spoke to came over and started talking to us about what we will "experience" with a Tesla. He bragged that he had a slightly older S, and then my wife mentions to him that he had actually met her a few nights before... and that we already had a Model X and this was our second Tesla. She told me it was him after he walked away. I appeared that he genuinely did not remember my wife, not surprised, but he was surprised that it was our second Tesla. Btw, a few weeks later, we picked up a second Model S, saw the same guy again and told him we were picking up another S. The expression on his face, priceless.