I’ve used the 510 since it came out a few years ago and to this day, it has the best noise-canceling microphone of any Plantronics Bluetooth headset I’ve tried. Many of the newer models are extremely small and use an ear gel to fit into your ear instead of behind your ear like the 510. I think it comes down to personal preference; if you want small and average microphone quality, there are many in-the-ear models available. If you’re comfortable with the ear piece being a little bigger and resting behind your ear, the 510 is a great way to go.
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Get unwired! Bluetooth headsets put an end to wires, cords and limitations. Plantronics Bluetooth headsets let you take your calls up to 33 feet away from your Bluetooth enabled device; or take control of your voice-enabled PC or PDA-while keeping your hands free!