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I bought this knowing that as with all Xbox 360 headsets it will last a few months, break, and generally have poor quality sound. I was right, this is no different. The headset is made form thin plastic and has two thin foam pads over the microphone and ear speaker. The foam is easily removed, it's not glued on or aching like that. Even the microphone mute on or off switch is made from a thin plastic which can crack easily. Just step on it by accident and it will split.
The headset has poor sound quality but is louder than my previous headsets. voices sound monotone and distorted at louder volumes. The audio quality is compromised by Internet connections but this is nothing to blame on the headset, even on a good quality connection the audio quality is not good and often sounds distorted, that you can blame on the headset.
The wire is thing and easy to snap so don't bend it about too much. The plastic that runs over your head can be pushed outwards away from the main frame of the ear speaker so if you have a large head you can expand this outwards and fit it to your size. I have an average sized head and I push it right out. Above average sized heads be warned, it can snap if you push it too far.
Microphone quality is questionable and seems to pick up more breathing than words. You need to have the headset rammed right up into the roof of your mouth to be heard at a reasonable volume and having it half an inch away from your face is far too quiet. You have to speak up or shout like most players do on Xbox live to be heard.
There is no lag in audio sending and receiving through the headset other than the lag caused by Xbox live. For example, setting the Xbox to play audio through headset and TV is a great way to test this. If the audio comes out your TV then a little later comes out the headset, that tells you if there is lag in the headset. There was none for me, both TV and headset passed audio through at the same time.