"It was a Christmas gift - so far I'm very pleased."4.0 starson by jetstew
Pros: The sound quality both in and out is great. I especially like the noise canceling feature. My Jabra bluetooth was good but people always complained about the background noise.
Cons: The only con I have found so far is that the bluetooth seems to really drain my iPhone battery quickly. I will have to learn to turn it off unless I am using it.
Summary: Bottom line is it seems to be all that the AT&T sales person said it was. It fits very snugly in my ear; the sound quality is very clear; the connection is quick; I enjoy the Ear Piece app that I have installed on my iPhone, it helps to really customize the 510 for your own personal taste. Like I said, the only drawback that I have seen so far is that it appears to really drain my iPhone battery, then again, I do tend to have a couple of friends that I talk to "at length". If there is a solution for that I would really love to know.