I have read all the posts and you guys have me excited but I have no idea which one I am excited about!
I have had MANY BT earpieces and most of them are junk. Maybe it is my unique body chemisty (LOL) or maybe just my unlucky pairing between phones. I am always told that my people cannot hear me clearly! I have the whole moto line....I am done with them! I had a jawbone but that thing was not comfortable and the customer service was a joke!!! Needless to say my wife has no forbidden me from buying the next best thing ( i have a tendency to do that

) I was thinking a blue ant until I read about the 510 USB.
SOOO...the million dollar question is which one? My boss says the 510 is the best and I should go with the 510 USB...some of you guys are saying the same but then it turned to the 520.
So, what is the verdict?