OMG... for every question there is another question
value seems ok but if you can get the list of options that would be helpful... you did not mention pano roof, are the black seats leather or textile, does it have the premium upgrade package which gives you some lighting differences, power lift gate, and some other goodies but I am not an expert on that package....19s are a more comfy ride especially without air suspension and hopefully there is some significant tread left...also does this have a sub zero package (not that you need it) or the dual chargers) the lack of radio upgrade means you cannot put XM into your car if that matters to you unless you connect it through your phone,... like i said the original sticker or options list would be helpful..
No LTE is not a problem it is a $500 upgrade and not worth it at all... As I understand it Tesla regulates the data speed anyway so there is little gain in LTE over 3g
the only way to say if insurance is good or bad is to compare it to what you are currently paying or would be paying on the x3 it should be negligibly different
you can go on your power company website and see if they have EV rates
Also plan on around $700-$1200 to put a charger in your house depending on your situation and current power configuration.
What you need to learn on the battery is range at 90% and 100% the owner should be able to tell you that (and show you that easily) my 2014 P85+ has a range of 234 - 235 miles @90% and 265 at 100% which I think is really good.. those are the numbers you are looking for... if he tells you his 90% is 220 miles you have some battery degradation to consider..
the fact that the car has all software updates is just fluff... updates are automatic so that is not a selling point at all.
the other safety features like blind spot monitoring and so forth were not introduced in the Model S until AP1 came along so in this case the X3 has more advanced features.... 2014s have parking sensors and folding mirrors LOL
the car also has no spare tire and that is dealt with by roadside assistance but i have no idea how that works with a service center so far away.... although there are many owners in that same boat so they could tell you better than I could.
in terms of value it seems well priced compared to CPOs currently available... look in the marketplace section and see if there is a comparable car... people are not shy about assessing a car's value in that part of the forum...
Other people may know more about this than i do but i also think there is a way that he can bring the car to Tesla and get it evaluated for a fee of course but it might be money well spent and since it has a month or so left of factory warranty it might be a great time to have Tesla go over the car thoroughly....
Good Luck ... PS there was no picture attached....
