I have used the Plantronics Voyager 510 BT headset for over a month and can say I am very pleased with the sound quality--both outgoing and incoming--it sounds like I'm right beside the person with whom I am talking. I often use it outdoors, in the car, and in the house and so far it performs quite well in all those areas. I get the best results when I have my cell phone on me or am within 10 feet of my phone. If I get out of range when NOT talking on it, it will beep to let me know and beep again a different tone when I re-enter the accepted range (approx. 30 feet). When I AM talking on it, the static will increase until I get back within that 10 feet or so. Since I live in a poor reception area, I usually need to set my cell phone in an area where I can pick up a signal, and the Voyager 510 allows me answer away from the phone--at least until I can get to closer range for best reception.My biggest objection to the headset, and I guess it is minor--I don't like the flashing blue light that tell me it is on. I have it SET to NOT flash, but if I get outside of range (>30 feet or so) when I am NOT talking on it and then re-enter range, it will start flashing again--if I stay out of range too long (more than a few seconds). I can't see the flash but others can--and I sometimes forget to check it for flashing--and end up looking like a Christmas tree. To put it back into its non-flash mode again, I find I have to turn it off and then turn it back on again. If anyone knows how to deal with this quirk I would appreciate knowing how.It is fairly comfortable to wear, and I am glad it came with 3 ear piece options to see which fits the best, as I did have to try all three to get a comfortable fit--and at times even forget I am wearing it. I don't talk on it constantly, so have had no problems with battery life so far. It recharges fairly quickly--maybe within 1 1/2 hours?? I researched and read hundreds of reviews before deciding on this Voyager 510 BT headset, and feel for its relatively inexpensive cost it does a more than decent job.