Before purchasing these headphones I read some very mixed reviews about them, many people had mentioned poor quality sound and a "warbling" sound. Since purchasing these headpones I have enjoyed listened to my music through them with no "warbling" sound experienced at all for many hours. The overall sound quality is fantastic with very good mid and highs and good bass performance. The headphones are extremely comfortable, and fit tight, yet well cushioned around the ears. The cary case is a little on the large side, but luxurious and has a designated space for the headphones and all accessories. The AI noise cancelling works very well, automatically monitoring outside noise the automitcally select the best noise cancelling profile, these can however also be manually adjusted. I wouldn't say they get rid of the claimed 99% noise, but they are extremely effective. These are a great buy, I'd highy recommend!