i use G930 for already a three years. even tho, battery is slowly dying (it degraded from 10 hours to 6 hours), i used them almost every day of year for at least 6 hours. signal transmitting and receiving is great, if you don't have anything next to dongle (like wi-fi router, for example), no sudden disconnections/reconnections even through a 3 concrete (!) walls, sound audio is superb for wireless headset (imo), but mic could use some better membranes.
all in all, it worth the money Logitech asking for it.