Its sound is awesome, and easy to wear, very helpful while running it sticks with the ear and never fell down, the design is excellent in compared to other headsets. price is little high but anyway its all give a super performance as I have been using this since 6 months, still no complain, gives the same performance what it was giving when I bought it new, the best thing I found in this headset the design of the speakers which is easy to compact with the ear, it fits with the ear very comfortably, the volume switch is nice and it detects very fast, its better to but plantronics bluetooth headset rather than other companies headset like senhiezer, sony, mpowswift or skull candy as I have used those ear phone in past.
I suggest if you want comfortable and sound quality you must buy plantronics bluetooth headsets. because money is so valuable.