my painted interior surfaces look fine so far. i even put a couple coats of cleaner/wax on the center console lid to remove a small scratch.

even though the manual says all you have to do is wipe down the seats with a damp cloth, i still treat mine with a leather conditioner. leather needs conditioning, especially if exposed to moisture and extreme temperatures. if left untreated, and it does dry and crack in 5 years or 10 years you have no recourse since it would fall under wear and tear. using a pH balanced leather treatment won't have any affect on your warranty, and you may be rewarded with much better looking seats years from now.