So after a few months of wear and 80K miles flown i thought it was time to do an update on this headset.

The good. The headset produces AMAZING sound! After the break in it just improved. Dual drivers make all the difference.

The Bad They are HEAVY after a few hours of wearing them inflight. They produce pressure points on long flights that make them rather uncomfortable after 5+ hours in flight. I have since reverted to my Bose QC15's for long distance flights. The sound on the Bose is not as good as the M40's but the trade off in pain free ears is worth it.