Use the headset in connection with the Xperia Play and have found no problems. Connection and control without problems. From time to time there are slight connection failures when additionally my Bluetooth clock is connected to the phone, but so rare that they do not even bother enough to make the "effort" to separate the clock.
The headset is not too big and not too small. It will not chunky, but is large enough to enclose the ears. the cushions are comfortable and can be worn well on longer journeys. On the extreme setting, it even fits on my giant skull. Control via the buttons is simple and works, wass I saw already solved much worse at other headsets. Processing is simple and relatively robust for plastic, but for 30-40 more than adequate.
The sound is very good. Ups n bit flat, but very good bass. Definitely better than the 5 BTheadsets that I had so far, but even better than many of the normal headphones that I use. Background noise is virtually non-existent. The voice quality seems despite missing extendable Micro, to be very good. I have not tested myself, but frequent demand for calls and was always good to understand.
The battery is also good; I did not test, but load despite irregular and often 2hr bus tours, the battery has never given up before from my phone :)
small and only downside is the manual. A7 large list in several languages (partially with different text in German and English version) and leaves some features.
Bottom line is: very good headset with a price that is unrivaled. Of the 5 BTHeadsets, I've used so far, it is of high quality and sound with only one comparable. That was my Plantronics Pulsar 590A. Perhaps from the processing only n tiny tick better, but I've spent on it 2 years ago 180. and today you can still for 100 to 150 pay, obviously no comparison to 30 - 40. Can this headset only recommend: 5 stars :)
