Got my S85D 5 months now. Have logged 12,000+ miles on it and love every mile of it. Used autopilot 99% of the time--even just for one block of stree I'd use it; seeing it can do what it (autopilot) supposed to do really thrills me. Naturally I am thinking also about my next car and it must be a MX of course, since no other car in existence can replace a MS. Playing around with MX configuration on Tesla site with same configuration of my MS, I found the price difference is just $5,000. Woh, I wished I did this when I ordered my MS, as for just $5,000 difference I think I should get a MX instead. What comes with this $5K difference are: bigger wheels/tires, better functional doors, better air suspension (5 vs 4 options), more interior space. Oh, MX's second row seat is not foldable and this would be a deal killer for me as this won't allow me to sleep in it when needed like a station wagon. Assuming the unfoldable 2nd row seat does not make difference to you, go play with MX configuration. If you are thinking about submitting order for a MS may want to get a MX for mere $5K more right away now instead of 8+ later.