Just got a pair today and have tested them briefly at work — every function (BT pairing, wireless stereo over BT or USB, daisy-chained multi-speaker) has worked fine for me, tried all the different connection methods (USB+wireless, BT+wireless, USB+wired, and 100% wired) and noticed some weird things as mentioned before.
- USB+wireless/wired sounds off, one channel is noticeably different, not sure if it's just volume or if it is also lacking treble/detail. I also heard pops/clicks regularly over USB.
- BT+wireless sounds weird and hollow with low audio volume from my iMac (late 2014), but great from my iPhone (6S+).
- 100% wired has so far worked as expected, sounds balanced and great.
I really wish they worked as intended on the USB/BT wired/wireless modes, but my intentions where to use them with a HiFiBerry DAC+ setup for Airplay, so I hope that will work fine for my use at home.