I'm one of those loonies who worries about my phone trying to kill me with it's radiation, so I bought this to reduce my exposure to it. Bluetooths produce about 10% of the radiation that cell phones do.The sound is great, no complaints on that end.however, I do have conversations with loud people.. And when the person on the other end raises their voice (like screaming or laughing a little too loud) they do hear their own voices.EASILY fixed with the volume control right on the earpiece.Portable and discreet, I keep my phone in my backpack's side pocket and the earpiece in my jeans pocket. When I hear the phone ring I open the earpiece and tada!The range on this thing also shocked me. I could easily walk around my room and do all kinds of chores while I spoke on the phone, leaving my phone in the opposite corner of the room charging.At first it does feel like the earpiece is going to fall off, but after a while you'll get used to it and realize that this bad boy isn't going anywhere.Not perfect, but definitely worth the money I paid for it.Only two cons I noticed are:The echoing when the person on the other end gets too loud.And I would would have preferred of the boom opened in a circular motion as opposed to flipping open. This way you could keep the earpiece on your ear at all times with the boom closed, and when a call came in you just opened it right on your ear. Since it flips open, you have to flip it open and put it on your ear once it's open. It has about a 2-3 second delay on answering the call to give you time to get it on. It will then beep once (in your ear) and connect the call.I have a Motorola Razr V3 and it was a synch to sync it up. The instructions on how to link up with bluetooth devices is included with your purchase.