These headphones are amazing! The bluetooth works great and is easy to sync up. 17 hours of use before having to re-charge means you can focus on using them instead of wondering if they are going to die in the middle of a song. They cut out for half a second when I had my phone in my right pocket, but that was alleviated by putting my phone in my left pocket. This only happened when I turned my head while checking for cars when running. Music quality is outstanding and can't be matched by ear buds. They are extremely comfortable and never get annoying while wearing. I would recommend these to anyone who wants to enjoy their music while not having to worry about cords while running or working out. Very pleased!