I've been happily using Plantronics 903BackBeat. The 903 is out of production, superseded by the 906. Excellent sound reproduction and molded silicone ear channels make long term wearing comfortable.
At one point I thought the 903's receiver had failed and bought a Emerson 510. Now I know why it was on sale. Very narrow frequency response biased to the high end. They might be OK for cellphone or 2-way communications use, but not for music listening.
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