I'm currently researching and debating about which year model I should buy. There is a used (not CPO) 2017 XC90 T8 Inscription (MY3/17) with 33k miles on it that comes fully loaded with climate/vision/convenience package and air-suspension that looks very attractive, especially with a price tag of ~$51k. However, I am also interested in a CPO 2018 XC90 T8 R-design with 17k miles that is also fully loaded with air-suspension, but cost ~$62k. The debate I'm having is this: do the upgrades in the 2018 model, notably the bigger battery and suspension tweaks, justify the $10k price difference. Are there other differences between the 2017 and 2018 models that you guys find to be important and why?