I bought my Model X 100D in May 2018 and paid $115,000, w/o Ludicrous Mode, and w/o Full Self Driving, but with all the other options. Now you can buy both upgrades, with the better suspension, and the higher range for less than what I paid. It's actually a GREAT deal forthose who have not yet purchased a Model X. Yes, I did get the benefit of the $7,500 federal credit, but I would have liked to get both options had I been given the choice last year.
I liked the MX so much that I recently bought a Model 3, but this time with the Performance Package + FSD options. The M3 drives so much better than the MX, but they are (2) completely different cars. Both are great, and I have no regrets, I just would have liked to get both features on the Model X. I also missed the FSD upgrade for $2,000, I would have purchased for sure, and I hope it's offered again.