i have kept in on since owning the car. the handling is a little weird to me hitting turns hard vs my forester xt which had a very modified, stiff suspension. i was trying to put my finger on it and i would describe it as squirrelly. i turned it off today on the way to work and the handling felt much more preditcable. i thought it felt much better then with it on. any preferences out there. i guess in the snow i would turn it on.