With CSL from H. but I done business in computer things. All the more skeptical I was also refer headphones there. The CSL 610 was so good that my wife has taken it simple and do not want him to give up. Since I had ordered me a 640er to avoid shipping costs, I now take this. But the 610er liked even better the sound forth. I recommend the headset to buy, but never to lend the music-loving wife :-). The halt in the ears is through the anatomically shaped plug incredibly good, I buy me the again ... :-)
