I can unfortunately only speak from my E3, which anyway always has flaws in the operating system. Since I have the phone itself only been two weeks and came from Apple, I may be a bit biased.
Blauäugig I've assumed that the connection is established automatically Duch NFC and the music continues. One might think. Utopian spoken, I'll get the phone out of his jacket and not at first dudeldudel.
Nope. You have to pull the phone out of his pocket, unlock the screen, ideally even open the Walkman and then hold the adapter to the headset for a smooth connection. After about 2-3 seconds then the connection is established. In 3 of 10 cases, but then the sound comes from the phone and not on the headset: /
One / two songs heard, comes one that I would like skipping. Operated switch, nothing happens. Sometimes klappts, sometimes not. Apparently sometimes travels from the control connection.
... And what the others have written, because of ambient noise etc. is also true. I feel, however, rather than pleasant, as I will a bit uncomfortable after prolonged listening in a soundproof room (head). The sound is really okay, I can not complain. Feel is so-so but acceptable.
Without cable is better than me, I'm just not behind why I hear after 30 minutes of music have sometimes verlohren 20% energy and sometimes only 4% (on phone).
Bottom line, the headset is quite ok (for the price). But who puts something of value on reliability, should pick up the cable as yet. I assume that is the bad connection of Android (4.4).