Echo problem. Can't hear it on my end when I'm talking through the earpiece, but others get echoing on their end when they talk. My brother has one of these. It works flawlessly. I never hear echoing on my end when I talk on a phone to him. So I bought one for my Motorola Razr. Others were complaining about the echoing. Bought it online and the company caringly replaced it for me. 2nd unit-same problem. I'm beginning to believe it's luck of the draw with these. I'll be going to a local store to get one now and do more trial and error. If I get one that works, I'll love it. Size is great. Comfortable to wear. Features are pretty easy to work.-----LATER-----Finally got one that works. My best advice on this unit is to buy it from a Local Bricks and Mortar store that will exchange or refund. I had to go through 2 bad units (echo problems) tested on 2 different model cell phones, then number 3 worked right out the box. Unfortunately, the first 2 were from an online vendor who, now refuses to refund our money. Something like this, spend a little more and buy from the local store.Charges quickly. Works fairly easy. Has a few quirks that I can live with, but wish volume level would go higher on my end as I sometimes have to strain to hear callers. Other than that, very pleased with it. A very worthy accessory for hands free communicating.