This is a bit different from the original review, addressing 4 common questions and testing with EDM music tracks.
http://www.hifiheadphones.co.uk/community/threads/grado-gw-100-wireless-headphone-followup-review.4534/
Grado's first wireless/Bluetooth headphone is both musical and fairly neutral. I admit to being pleasantly surprised by the sound quality. Highly recommended.
http://www.hifiheadphones.co.uk/community/threads/grado-gw-100-wireless-bluetooth-stereo-headphone-review.4533/