Having a seat built. DW loves the heat, and truth told, I don't mind it myself! However, I am dropping a lot of coin on a leather seat that best be around a while. While there are no guarantees, do these heated seat elements last very long? At near $300 for the dual heat, it would be unfortunate to find its not working i a couple fo years! Thinking of just using that money on heated jacket liner for her intstead.