I was excited when this headset finally hit the market and was eager to ditch my over-the-ear style earpiece. I was impressed with the sound quality and volume levels, but what made this a deal ender was the way it excluded all other sound but the headset's. Wearing this marvel of technology turned music into the days of AM radio with one ear taking in all the sound from the outside world. I could not hold a conversation with any one positioned on the side I was wearing the device. In traffic it would cause me to not recognize the direction from which sounds were coming from. Nice idea, but not safe for what it was intended - hands-free talking while doing things like driving. Additionally, I fly aircraft that require the use of EAR and three-pronged ear plugs and headsets every day, and yet I could not get on with this in-ear device's intrusion into my ear canal. A great design, but in the end I went back to an over ear headset.