I used theJabra BT500 Bluetooth Headsetfor nearly two years, and for the entire duration of that time received complaints from callers on the other end that the ambient road noise was unbearable. (Similarly, when I used it while walking around in Manhattan, people would say they could not hear me over the crowds, blaring sirens and horns, construction equipment, etc.)I thought this problem of amplified ambient noise was endemic to all Bluetooth headsets. Then I tried the Voyager 510. Over several months of use, no complaints whatsoever about road noise -- people just can't tell whether I'm driving or not -- even though my Volvo S70's interior cabin is a bit louder than that of many other cars. I couldn't be happier with this device.