I am one of the original Model S owners. I received my Model S in December, 2012 and thought that I would pitch in my two cents. I never had any problems with Tesla service and the only comment that I can make about improvement....well, it certainly has improved since the 2012 models with auto-pilot and all. I can't go into any other discussion regarding whether the car has improved but I will be able to make some comments soon. I just ordered a new Model S and should receive it soon. By the way, from my experience with owning a Tesla Model S, it is constantly improving with the frequent software updates. Good luck in your decision.