These belong to my wife. She has had these headphones for over six months of constant use. She works a job that requires 8-11 hours per day of use or standby (powered on). She averages 2-4 hours per day of talk time. She tells me these headphones are, and continue to be, very comfortable to use; and the sound quality through the headphones is excellent, with no distortion. She says the microphone gain is also good; she has never had anyone complain they couldn't hear her, like her original headset. Even after over six months of use they are in excellent condition, showing no signs of wear. She uses them primarily with the 2.5 GHz connection, although the few times she used the Bluetooth connection they have also connected quickly and flawlessly. She never had an issue with them running out of charge while working; although she does plug them in each day after work. Overall a decent quality product for the price.