Hi. I've bought M3 and there is popping sound few seconds after playing sound. It's random. For example one time in left earcup, next time in right earcup (sometimes very quiet). There are also sound interruptions for few seconds after switching to second device. Do you have the same issues?

Have you tried Sony xb950bt, mk1bt mk2 or Plantronics Backbeat Pro? Which of these headphones would you choose? Plantronics has the best functionality but is sound also the best?

Hi, any impressions? What is the sound quality? How much sound do these leak? I want to buy these headpones but they have bluetooth class 1 transmitter which can transmit 40 times more radiation than bluetooth class 2 transmitter (smartphones emit similar radiation level) so this can be...