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How does this compare to the Plantronics 600 series? I have the Plantronics 640, but the 645 and the new 655 both have DSP and are Bluetooth 2.0. They are all also about the same weight as the Sony Ericsson, but a quarter inch shorter. I'd be interested in a performance comparison, since I've been thinking of upgrading my 640 to the 645 or 655.
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