I owned the Zalman 5.1 to start with, was not happy, bought the Medusa 5.1, annoying buzzing from its amp, then the plastic part holding the left earpiece broke when I dropped them, bought another Medusa 5.1, same buzzing noise and this time the same plastic part holding one of the ear pieces broke again.
Also, I was really fooling myself about 5.1 qualities with headphones, it just doesnt work properly no matter how much you try to set them up.
I'm going to buy some quality Sennheiser phones next.