I bought this ear piece after doing a little research that gave it 8 out of 10.  The price was very reasonable considering that others were selling for twice as much.  Later, I did find a couple that were rated higher but cost more, and weighed more as well.  The only complaint I have is when you receive a call it comes in very loud and you have to turn it down either by the ear piece or on the phone even though you changed the incoming call volume.  Oh, if you can't decide, go to the Cardo Systems website and look up the 700.  There you will see that a German electronics magazine gave it an outstanding review.  In other words buy it!!!!!!!!!!