Last I checked, the Sub Zero package was heated steering wheel, heated mirrors, heated wipers and heated rear seats. Of those, only the heated steering wheel is of interest (and I really miss having that) but it isn't worth $1000 to me. Do you really get much benefit from the other parts of the package? If carrying passengers in the back seat I suppose it would make sense to have heated rear seats. But heated mirrors and wipers really aren't something that I've ever needed in my climate, which is probably not as wet and icy as yours. Coldest it gets here is typically -20ºC or so, a few times a winter, but I once saw -30ºC. -10ºC to -15ºC is pretty common, but usually at night, with warmer daytime temperatures.