I have a Limited with the White Nappa Leather, purchased 3/2014 like you. 27k miles and no issues at all with the leather. No stretched areas, creases, or notable dirt/stains. I clean the leather about 2x a year using Taino's Leather Cleaner and Leather Conditioner. Other than that, I wipe it down with a damp towel after washing the car. The leather still looks like the day I bought it. I'm in Portland, Oregon so the heat isn't very extreme. No tinted windows either. Sucks to have the leather cracking already. 