I special ordered my ES350 just for this option. It took 4 months to get the car. However, the option is spectacular. I was concerned that I would get a lot of false alarms (from cars nearby in other lanes) but I haven't had one. It tracks only the car in front of you even on highway curves with cars in adjacent lanes. The cruise control can be set for normal operation (just set the speed as with any crusie control) or by radar. In the radar mode you set the speed (as in normal mode) and one of three distances (far, medium or near). I'm a perfectionist. While I have complaints about other Lexus issues (Nav lockout, very poor audio system, poor interior lighting) the radar cruise control is a highlight for people who use cruise control a lot.
Peter
:P
