If you own a smartphone or any other device which has stereo bluetooth (A2DP), using this feature is the wisest decision. Not having to worry about the wires or even about picking the device for changing tracks and volume makes the difference. And if you're in a budget, this headset is the way to go.This headset costs less then 40 bucks here in Amazon, while the motorola S9 - a much prettier choice - cost almost the double. And, if the look isn't great, it's not something that outstands in the streets. By the other side, this headset battery lasts for more hours that I can measure: I use it a lot, my Treo 650 battery has already been drawn, I have already forgot to charge for two days in a row, and I have never make it to end the battery.Configuration is easy and it is also fantastic as a hands-free for you mobile phone (or even skype). The sound quality is great in both sides of the call, even if you are in a noisy enviroment. Actually, as the call sound come from both sides of the headset during a call, it helps a lot to understand the other side.Some people say it is heavy or clumsy, but I disagree. I can use it for all day long without a problem and I have little problem wearing it together with my glasses - a little adjustment and they fit just fine.Maybe there are better bluetooth stero headset in the market, but I must say that the cost/benefit of this one is something hard to beat.