Es tan buena, que en un ambiente "tranquilo" como pueda ser en el salón de nuestra casa, apenas se nota diferencia cuando encendemos la cancelación ACTIVA. I cannot hear my kids laptop day in and day out! This is totally worth the 25 bucks. On occasion the bottom cover slips out, and typically I have this on my purse just hanging - I would really hate to lose my buds because of this issue. Die Brillianz ist fast so gut wie die Beyer-dynamic-over-ear 770. I wasnt too sure what to expect from these pajamas because the price was so reasonable. These fit as expected, are comfortable for daily wear or for the gym. However there is a problem when installing it doesn?t align perfectly and the rubber washer needs to be cut in half I recommend to anyone installing if that happens use a zip tied to make sure that that rubber washer stays in. Dealers will put a new one in for you if you would rather spend 500 otherwise, grab one and put it in yourself. Hard to believe but true with me !