I have a 12/ 2014 Model S and have been contemplating trading in for a newer Model S for multiple reasons. I had wondered besides the obvious such as AP HW2 hardware improvements if there were any improvements in fit and finish. I remember Elon reportedly making the comment of continual improvements that are continually being done, but wondered if any would be noticeable. I have had a 2017 Model S as a loaner for the last couple of days. The loaner was made 3/2017 and to me the improvements in fit and finish are subtle, but very noticeable. Firstly the 2017 is much more quiet. My motors have always made whining noises when accelerating or decelerating, which are very audible, as well as at 77mph make a constant whirring noise. In the 2017 motor noise is barely audible. Secondly, the 2017 is much more air tight, and sealed with very little wind noise intruding on the highway. In my car, the doors have always closed and seemed slightly off kilter, like it closes and hits at two points not perfectly lined up. With the 2017 the doors almost, (I said almost) have a germanic precision, but without the weight or heft of a more solid door. It isn't that my 2014 is performing abnormally, I have had all the above issues in my car checked and were told they were within specs. The subtle part is that driving and sitting in the 2017, just feels more solid and better put together. I was wondering if anyone has experienced this?