The Kokoon Headphones are very comfortable and do a very good job of blocking out ambient noise. They take a few nights to get used to - but then they are very comfortable and help improve sleep quality when you are used to them. I am impressed with the durability, sound quality, and comfort. The app is somewhat basic but is a nice added extra. If you are buying the headphones as a sleep tracker, wrist-mounted trackers will do a better job - but as a pair of ultra-comfortable headphones that will last a lifetime - these are spot on.
Pros and Cons:
Bottom Line: Yes, I would recommend this to a friend