I have just returned from a 1,000+ mile round trip - San Francisco Bay Area to San Diego and back, mostly on Hwy 5 and hands-free worked spectacularly well. At the beginning I had to make a small adjustment to the seating and steering well because it kept telling me to pay attention. One thing that my wife and I noticed noted was that the car kept giving us the "pay attention" message when we were having a conversation and the driver, either she or I, moved the head for a few seconds to face the passenger. Also, the car was very good to quickly slow down when some other car cut in front just a few feet away.