I need to do a lot of teleconferencing on the road.  Most of these phone meetings are with people in other countries (i.e. some accent), and they usually use a speaker phone instead of individual headsets.  I have been using a one ear Bluetooth headset, and could hardly hear what they were saying.  I need a headset that covers both ears.  So, I bought this headset because of its good reviews.The sound quality of this headset is wonderful.  I can now hear people's conversation much better than before.  It comes with ear pieces of 3 different sizes.  I really like the ear pieces as they fit into my ears very well and block most of the outside noise.  For headphone sound quality, I'll give it 5 stars.However, the microphone quality is not that good.  It is very sensitive and pick up a lot of background noise.  People can hear me clearly if I'm indoor in a quiet room, but if I'm outdoor usually they have problem hearing me.  One of my coworkers is using the 700 model, and he complains the same thing.  For microphone quality, I'll give it only 2 stars.I have also been using this headset a lot when I do exercise (elliptical machine/jogging).  It's light weight, and its Bluetooth connection is very good.  I can put my phone 15 feet away and enjoy my music.  When I used my old one ear headset for music, the connection was not that good even if I put the phone in my pants pocket.  I used it on iPhone 4S and iPad 3 for music, phone calls, and audible app.  All Bluetooth controls work fine. 

Question: How was the sound?
Answer: The sound quality of this headset is wonderful