This is a good product. It is very comfortable. Easy to use and battery life has been better then the specs have said. In comparison to the Jawbone I had the sound, mic pick up, distance is the same, but the 510 is soooooo! much more comfortable. In comparison to the Scala700 the distance in the Scala700 ( distance = headset to phone )is the only thing that was better on the Scala700. The Voyager510 was better in all other. Oh and don't forget it is so so sooo comfortable. I forget it is even there and I'm a mechanic with my head moving around in engines all day, it's never fallen off or bugged me once. I gave it a four because I would like to see the distance improve. It was nice to take my phone off my belt and leave it on the desk, while working on engines, when I had the Scala700, can't do that now.