I don't use it at all. Whenever I drive, it is off. DH uses it all the time, though.Well I can't speak for the Honda as I have never driven one but I can tell you that for the Kia Soul it DOES work like it is supposed to when you leave it on all the time. No loss of power at all.
Having to remember do I turn it on or off and then remember to do the opposite at the right time would drive me up the wall and definitely make me a distracted driver. That is probably why I also don't drive a stick.