I have to take back what I said about the sound, there is a channel imbalance, but only in the lower frequencies. I didn't notice it at first because of the music I was testing with, but it became apparent that something was off when listing to songs with more lows. I then moved on to an online tone generator, and it's very evident that below about 50 hertz the right driver starts to drop out.
This leaves me confused about the Woox vs Gibson issue. The box and headband indicate that these are a Woox pair, but they've got the glue on the pegs holding the pads. My impression was that this started with Gibson. QC issues could of course occur either way, but I've also read about the channel imbalance being associated with Gibson, not as much with Woox, but maybe quality has been hit-or-miss all along, and Gibson has just gotten more bad publicity. Or perhaps this pair is originally Woox but refurbished by Gibson? Or maybe some of the Woox started to have the glue even before the switch to Gibson? Again, I'm confused, but these are going back