I had a Smart Turn System installed about 6 or 7 weeks ago and All I can say is it works perfect. It always turns off the signal light every time after a turn. When I change lanes it will turn off the signal light .The only it won`t turn off the signal is if you are making a long gradual lane change . The unit cost $120 Canadian and I was charge 2 hours to install it but you could do it yourself. There are lots of reviews on youtube. I bought direct from STS online with a $10 coupon.:blob4::wink: