Everyone complains about heat in the footboxes, but I've never noticed that that my feet were too hot on the summer days or that my feet were kept warm on cold winter days, and I have driven in temps as high as the upper 90 and below freezing in the winter.
As for the seat heaters, I can honestly say that I have never wished I had them, even on the coldest of days. Once I'm in the seat, it is not my butt or my back that gets cold, but rather my thighs. The heater does a pretty good keeping the feet and lower legs warm, but the wind always makes the top of my thighs cold. If I could figure out how to wire up a set of heated long johns that would be about perfect.
