I got my values today from Tesla. $10,000 below KBB. Since I have transferable extended warranty, it makes sense to attempt a sale to a private party IF I like the Model X more than my 2012 Signature Red Model S.
What surprised me is when I brought up how much more they were going to sell my car for, they quoted me their future sales price. About $3,000 less than KBB.
It was a bit frustrating to learn that their value was about half of what I paid 3 years ago. Their value would work out to about $1 a mile of depreciation for my usage. Considering cross country driving, it might be more cost effective to fly and save some of the trade-in value.