Share your experience!
I'm using the MW600 headset with my new Xperia Active (2.3.4), but I'm not able to get the sound through the headset when making a call? Playing music with both Spotify and the built-in player works fine, aswell as changing songs and pausing music...
When I get a call and press the answer button the sound goes through the phone-speaker insted of the headset, same thing goes when making a call... which makes the headset pretty useless - any fix for this?
Problem solved!
Keept pressing the "phone" button a couple of seconds, and selected the phone icon for sound input 
Glad to hear you got your problem resolved 
i like my MW600. i enjoy radio and its perfect while riding a bike.
last months i have lost for some reason the auto-answer. before when i listen radio and that moment somebody call me, i hear the notice sound and after few seconds the call automatically going to headset. but now it lost....
(my device is xperia neo V with 4.04. android version). on phone settings for bluetooth i didn't find any option for auto-answer.
any idea?