They have excellent, true hi resolution detail and are generally not harsh except a few times in the mid-highs, depending on the song. You can get an adapter to make them work with a current iphone. The Revolve+ does get twice as loud as the A1 with little distortion, which is helpful when playing music outdoors. Had misgivings ordering online but with these I was not disappointed. Never had that happen with a bluetooth headset before. Thus far, I am very happy with this wireless charger. I am sure the AirPods have better sound quality as well, but comparing these to the decent headsets I already have, I cant imagine that is worth the premium either. Decent bass, it is not a thumping but is more than adequate, and with crisp mids and highs (w-X-Bass turned on). So its an OK sandal, better than most, but not as good as the Reef Rovers with taller toe straps and wider side straps. Theyre very cute though, and comfortable.