Bottom Line = Everything is excellent except noise cancellation, but it's good.Pros:The size. It is very small and very light but not cheap. It fits very nice in your ear with a very small rubber ring that sits in the upper part of the crease in the middle of your ear. The small ring does not fit over your ear, so you can wear sunglasses or glasses and not have it interfere with that which is a major plus.The comfort. I wore it for 8 hours and felt no discomfort. After a while you don't even notice you're wearing it except for a slight decrease in hearing in that ear.The clarity. I could hear every caller with good detail and no hissing or any other kind of noise. The caller couldn't always hear me well but I'll explain that later.The Style. You don't look like you have some device implanted on your ear. No shiny BLING. Nice sleek, hidden earpiece that does not draw attention to it.The technology. You can charge it off your USB port and it comes with the adapter to do so. It does come with an over the ear hook if you choose. It has a feature that allows you to amplify what your ambient noise is around you. At first I thought who would ever use this. Then I went shopping with my wife and I couldn't hear her well out of my left ear because the earpiece sits in your ear and does block external sound from coming in. Not a lot but enough to be an annoyance if having a conversation in a busy store. I turned on the ambient amplification and problem solved. It's a very easy button to locate and turn off when you don't need it.ConsThe noise cancellation is just ok. If you like talking with a convertible or windows down at highway speed, get a jawbone. Talking in noisy loud streets with lots of traffic noise is also loud for the person on the other end.Driving with windows up, radio slightly on, AC or heat cranking, scrambling around in airports, no problem. The bottom line is if the ambient noise level makes you talk louder in order for another person to hear, then it's not going to filter it all out. For me it's not an issue.The last con is a slight reduction in hearing in the ear you have it in, unless you turn on ambient amplification which does burn battery power faster. I had ambient on for almost 2 hours and talked for 1 and the battery never went dead. I don't know the extent of battery life but it lasts me all day.