My only gripe is the battery compartment....hard to open/ close the battery contact (spring) can be fragile and misaligned to conact the battery properly. Bose can do better!
Sound quality/ active noise cancel/ super comfort fit for extended periods
the mini jack that attaches to headphone can be fickle....slight movement can cause sound to disconnect/ reconnect with just slight movement. Battery compartment door is flimsy/ hard to open/ close battery contact (spring) can misalign