As I cannot bear to use Monster Dr Dre Beat Studio anymore, I purchased the Bose QC15 noise cancellation headphone after comapring it with the Goldring. And today, I fully used the QC15 throughout a flight to Vietnam, about 2 hrs from Kuala Lumpur. 1. Noise cancellation - 9/10. It cancels off noise and preserve only what is intended to be heard. I can still hear the announcement through the PA at a moderate level though. 2. Portability - 9/10. The casing is well laid out and very slim, reduces the risk of snapping the headphones. 3. SQ - 8/10. The high frequncies can be very harsh at times. Maybe needs some running in. Low ends was excellent, sufficient and clean bass. Did not sound bloated nor extreme. Clarity was at par with Bose Around the Ear headphones. Listened to mainly Santana (the old stuff), Metallica, Janet Seidle and Beatles.