What surprised me most is its weight. For something of this size, it's a pen, it hardly feels and he is terribly comfortable. I walked three hours with nothing to complain about not any gene.
I struggled a little bit to understand that I had to go do it in direct contact with my phone but once read the instruction on the back of the box (a record does not hurt, but there are not a) sync is done in 15 seconds and then just turn on the headset and the phone finds it immediately.
I thoroughly enjoyed being able to trigger the music from the headphones without the need to highlight the phone from the pocket. The controls on the right ear are really well thought out. They have a different form which allows the simple touch of identifying them very quickly and change songs is a breeze, adjust the sound too.
His side, no complaints, I found it excellent. I listened to a lot of rock but also two symphonies and sound, very enveloping and well reproducing bass is really quality. the volume is very powerful, low-level sound is very well rendered.
I carry around all this great helmet, perfect listening and nickel telephony, it covers both external noise without total isolation, which is essential for me in the street to keep some attention to what is happening around.