I purchased this headset after trying several others, and being disappointed with their voice quality, comfort, and range. This headset is the best I have tried in those categories, but has a major problem. When I received my headset I plugged it in to charge... after about an hour of charging the charge light began to flash. The manual states that the headset charge LED will go off when the charge is completed. I let the headset sit on the charger for a few more hours... aprox. 4 1/2 or 5 total... and still it was flashing. I disconnected the power, paired the device and began to use it... about 10 mins later I heard a weird chirp, and the unit went dead. I turned it on again, and after a minute or so of talk time the same thing happened. I plugged the charger back in, and the charge LED stayed steady for a short time, and then began to flash again. I left it plugged in overnight... in the morning it was still flashing. I unplugged it and began to use it, but it died again after a few mins, and the LED was blinking red just before it died (which the manual states it will do on a low battery). I searched the Logitech forums, and found a thread where several other people were having the exact same issue. I got a replacement headset from Amazon... but it does the exact same thing. Looks like there is some sort of battery issue with the latest batch... it's really a shame, because this is an excellent headset. I'm going to have to go with a Motorola...