these headphone deliver on the promise of CD quality sound . the replaceable battery be a fantastic feature , with a charger build into the transmitter there be no reason for any loss of listen time due to recharge . this pair have be in service for almost 3 year multiple hour per day and have be trouble free . my only two complaint be that I wish there be a way to remove the ear cup padding and clean it . the second one be interference with other 5.8 ghz device - maybe in the next version it will have a encode feature to prevent interference .