I think the Toyota autolight feature is pretty well designed in my opinion. Having owned several Cadillac with "twilight sentinel" (GM's auto lamp) and a Lincoln with the autolamp system... Toyota's design is far superior. I set it to auto the day I got it, and have never looked or thought about my headlights since. They respond immediatly to light changes (unlike my Cadillacs, which had a terrible delay) and as worked flawlessly. I will say it was an easy adjustment, since my last car (a Volvo) effectivel had no headlight switch (all lights stayed on all the time). Believe me, once you set it, and forget it you will wonder how you ever lived without it. If your system is slow to respond, make sure there is nothing blocking the dashtop sensor (like a state registration or inspection sticker).