I leased a MX 75D for three years and the expiration date will be April 2020. I got the FSD option which as it turns out wasn't really worth it, especially since the Hardware 2 equipped car won't ever be capable of FSD anyway. The few advantages the FSD option affords are nice but for the money I could go without for another year. I have heard that there are a number of improvements on new models such as increased sound insulation, better motor/battery tech, hardware, processors and who knows what else? I haven't seen these listed or discussed anywhere that I know of. Can someone here point me to a source for what improvements have been made in three years?