The audio quality is excellent. Great bass and hi-response. Installation with an already installed blue tooth dongle is a breeze and just as easy if you need to setup a blue tooth dongle prior to installing the Air-Fi headset. Very well padded for comfort and controls are conveniently located and after a little practice your fingers will know exactly where the controls are located without the necessity to remove the headset and look for the controls. Mic location is easy to find and to always place the mic where it faces towards your voice. The mic location reduces any echoes from the room and people with whom I chat, compliment me that I sound as if I were in the room with them. Each charge lasts a very long time. I think I would run out of breath before the battery ran low. I cannot find anything negative to say about the Air-Fi AF52.
These are bass beasts! The sound quality is surprisingly good over bluetooth and they're perfect for long listening sessions as they're really comfortable the battery lasts an age. The bass does tend to overshadow the rest of the frequency range, and I'm not entirely convinced by the design, but these are fantastic headphones nonetheless.