The Plantronics Voyager 510 has been an absolute work horse for me for the past nearly 2 years. When I say workhorse I mean it. I put over 5 hours of talk time on this device 5 days a week for well over a year. I used it in a weekly 4 hour commute, during the day in the office, at night to talk to my family from the hotel and a number of other usages. I know this device and using it is as familiar as turning on my blinker in the car.