Registered 2019 SLC250
My SLC has heated seats and air scarf. The cabin heater is volcanic and keeps me warm even in sub zero temperatures with the roof down. The heated seats do a great job too. However my airscarf, even on max, is pretty tame (on both seats). The fact that the vents can't be adjusted means the airflow can easily be too high/low depending on whether you're tall, or like me, short. I assumed that the units fed hot air from the engine but learned they have their own electric heater, which no doubts dents fuel consumption due to extra alternator load. I generally drive with it off as it makes little difference.