I had two Lightspeed headsets and parts of another that came with a dismantle/ sell project. One had broken stirrups attaching the earcups, two were sticky and gooey. Two worked and actually one was superb with good NR, great sound quality and volume, and it was very comfortable. The separate battery box was distorted from heat but did not seem to affect performance. The rep on the phone was very nice and wanted to help but Lightspeed would not touch any of them since their parts inventory was gone. I came away wondering what’s with that sticky gooey deal… cheap plastics? The broken stirrups were crummy plastic, too. Later Lightspeeds look much better and I might consider one if my much loved but high $ Bose ever dies.