This is personally my first blue-tooth. I bought it after a lot of research. Prior to purchasing the 510 I spoke with many friends who use blue-tooth headsets, and their voice was often muddy and garbled. I have been told by many that my voice was clear and they could not tell I was on a blue-tooth headset. The quality on my end is quite good too. I also like the headset controls for answering and making calls using voice dialing on my phone (works great with my LG Chocolate 3).