Summary: I have better but more expensive headphones but for the price these are good. They are also very much noise canceling. I'm satisfied. I do wish the mic was of a higher impedance, it is a mismatch with one of my programs.
Summary: I'm going to start off by saying that these are good headphones for their price. They have decent sound quality, something I didn't really expect out of a $40 pair of headphones. The mic works and sounds very good. It isn't recording studio material, but it is fairly good. Dragon NaturallySpeaking has no problem understanding my voice through it, and my friends on Skype say it is pretty clear. I have also tested it on Audacity and it is good.
Pros: good sound quality, durable, microphone works well
Summary: I never got the microphone to work properly; when I tried to use it, the person I was talking to could barely hear me even when I was speaking as loud as I could and I heard a lot of echo/feedback which was highly disturbing. After trying everything I could to fix it on my own I contacted KOSS and was told "Thank you for contacting Koss Stereophones! It is possible that the sound card in your device us unable to supply enough power for both headphone and mic operation.
Excerpt: Качество сборки гарнитуры оставляет желять лучшего. Продавец в списке магазинов на сайте производителя, т.е. можно надеяться, что это оригинал. Насчет звука - как из бочки, только заношенные средние, отсутствуют как высокие, так и низы. Очень далеко до заявленного производителем частотного диапазона. Валяются дома старенькие 6-летние ур-20 и там звук на порядок лучше.