I have the 510 now.
What I like:
The fit. It's light and works well with glasses
The sound. I can hear folks great on the 700wx.
Battery. I don't think that it has ever went dead on me.
What I don't like:
I have stopped using it altogether because folks complain that they can't hear me. They even tell me that the sound quality is better with the speakerphone on!
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Republicans believe every day is the forth of July, Democrats believe every day is April 15. -Ronald Regan
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