They're supposed to be safer than using a handset while driving, right? Well I didn't feel too safe when I saw that lady last week with both her hands on the wheel, granted, but yelling at what appeared to be her car radio. Her head was down and both eyes were zeroed in on a spot waaaay below the dash. Not on the road.
Oh sure, hands free is safer. Instead of swerving all over the road and maybe getting a ding on your bumper, you plow headlong into a tree at speed. You can just taste the safety, can't you?