I have owned these for 1-1/2 years now and have used them mainly when flying on commercial jets.  Their ability to cancel noise is better than the several other low-cost models I have tried, especially on jets.  They are very comfortable.  Their sound quality is good but I wouldn't say excellent.  They appear to be more durably made than most other low-cost headphones.  I have had no problems whatsoever, in spite of them getting squashed in my briefcase many times.  They are relatively large, closed ear cup headphones, but fold up and store easily in a provided bag.