[Formerly YB-2]

After ~48hr of burn-in the C50BTs are considerably better. Seem to be a good match to the M3s. Got 4+ hours of playing while plugged in. Am now running the Bluetooth aptX connection and either they are continuing to break-in (as could be the M3s, as well) or the Bluetooth is better than the cable that came with them. That it could be the cable would not be surprising as it should retail for about $5. The sound is a pleasant surprise for $85. Comfort is good if not great. A bit too tight as a 'head clamp', but could go away with time. The drawback is their limited range. When I walk from the living room into the kitchen on the far side of the frig the sound dies. Not a big deal as the M3s slips easily into a pocket for ambulating.