Very good for a portable set of close back wired headphones. If youre stacking them it will definitely be noticeable. Then youll see it works like a charm! These are quite good except the "spring-type" action between the cement holding the bricks in place, can get tricky. A little less loose? Maybe go down a size. Two separate units, same problem. Additional note on the speaker - when playing music through it only the left channel was present. I have not used many of the functions but enjoy checking out the sleep tracker and use the pedometer and heart meter occasionally. Only reason isnt 5 is because when nothing is playing there is a slight buzz which is annoying. Only negative is it is impossible to put the pads on that go one the buds to fit your ears.