I will buy more! Excellent sound, IF you can get them to fit into your ear! In terms of sound, using 4. It also sounds better if youre a little ways away from it. Could feel the ridges in the rather firm foot-bed and feared these and the straps around ankles would cause friction over time. Sounds good and is fairly loud. The range of both was about the same. Got these headphones on 12/20/2017, so this is just preliminary. So does the charger - the charger wire is small, but can still play the song while charging. This is not a problem for me since my job is mostly standing.