I have a 2015 85D with the original Nappa Black Leather seats. After having a Jaguar loaner this week from my SC with bolstered, leather seats, I am exploring possibly upgrading my seats to the Next Gen seats. I did some research and heard you can do this through Tesla for 5k?? That sounds insane. I've also seen some people selling theirs. I would imagine if I bought from someone else, I'd need Tesla to swap them for me and I'd have to pay labor rates? I don't care about the rear seats since I have young kids right now in Booster/Toddler seats and will for a good 3-5 more years. I do have heated seats as well. I also need to sit in the Next Gen seats to see how comfortable they are.