I just pciked up and have started testing the Nokia BH-800 that is coparable in size to the JX-10. My early impression is that it is a much better unit. Sound quality my be better than the Plantronics 510, comfort is better than the JX-10 as the rubber on the insert is softer and the controls are easier to use. The neck strap is really cool for carrying it too. I haven't made any recordings yet but I have made test calls to friends, even while driving at highway speeds and no negative comments. A full review will follow in the next few days as I put it through its paces.