I have be use these ear bud and I like they both at home and at work . they work well to reduce the constant hum of nearby computer , distant conversation etc. . they help I keep my train of thought . I also like the fact that I can save my ear because I do not have to turn up music as high . chatter beyond 10ft away mostly disappear . I be surprise by the static buzz they produce , but the noise cancel outweigh that . type seem to stand out as the most audible noise . it seem to work best on constant rumble or hum noise . it seem as if everything noisy around you get push back 20 foot . UPDATE : the left earbud stop work . Sony will gladly replace the set for a processing fee of $ 46 . I be downgrade this product from 4 star to 1 star .