Mike kicked in yesterday and it was hair raising and very effective. traveling down a one way divided road at posted speed of 40 MPH in commuter traffic with a chevy SUF in front and a Metro Bus in back, both following distances were very close. Chevy in front slowed suddenly and immediately brakes engaged hard, I was already looking in the RV mirror at the time and was keenly aware of the proximity of the Bus. I had to press on the gas quickly to keep the bus from ending up sharing my front seat with me. The system works very well, but conditions need to be severe to engage it. don't tailgate people and it wont happen except in emergencies.