We are in a similar situation to other posters, with the further complication that any change will result in us losing ventilated seats (which are no longer offered, I was told due to durability issues). So our choices are: (1) keep 90D order, with ventilated seats and free supercharging. We can hope that we actually get a 100 battery and its later software upgradable to a 100 (what do you think are the odds, for early April delivery?) (2) upgrade to 100D, lose free supercharging and ventilated seats, but they will do this at no cost (other than price difference of 3k) (3) upgrade to P100D, we keep free supercharging, but still lose ventilated seats I am currently inclined to stick with (1) and hope we get the 100 battery and can software upgrade. I know if I choose (2) and then I heard about people who went with (1) and were able to upgrade to 100D for a fee later, I would much more upset than if I choose (1) and its not upgradable. I dont think I can quite talk myself into getting the P100D (if we could keep the seats I might do it), even though it would be fun. In 2015 we did a 5100 mile road trip in our model S 85D. Last year the longest trip we did was 1200 miles. We contemplated towing a camper for a family trip, but I somewhat doubt we will do that in the next 4 years (and after than we will probably upgrade our car). I am typically hot in the car when my wife is cold, so I was hoping the ventilated seats might help me feel comfortable without having to have the air blowing (does anyone know if it works this way, and if they can be on the driver side but off on the passenger side?) We charge at home, the free supercharging would only be used on trips. Part of the consideration is what will be worth more when we sell the car in 3-4 years, free supercharging or more range (I personally think its a toss up). Being able to drive from San Jose to Monterey and back without charging (as we can in our 85D) is a big plus, but I think we could probably do that with a 90D, we would just have less margin. Another consideration is that if a 90D built in late march is really 100 battery, even if its never upgradable, we could always charge to 100%, instead of 90% like we do today, because there is that unused margin, which would make a big difference.