"Peace Among The Bustle"4.5 starson by waldodio
Pros: Great noise reduction. Comfortable to wear
Cons: Careful ear placement required
Summary: I requested these headphones for Christmas to help alleviate the slurping, loud talking, and general obnoxiousness of a cubicle neighbor at work. After trying them the first time, I discovered they did something even better: they completely eliminated the loud hum of my building's A/C system, leaving me able to hear myself think and actually enjoy my music.
With a flick of the switch all low frequency ambient noise disappeared. I was truly left in a quiet environment. Of course, high-frequency sounds are not eliminated, so you'll still hear voices (though muffled) or equipment beeps, etc., but since I use them at work I still need to hear my phone ring!
Not only does the noise-canceling feature work well, but the quality of the signal coming through is very high quality as well. The mids and highs are clear and crisp, and the bass is solid without being overpowering.
The headphones are very comfortable. I wear mine the entire 7-9 hours I'm working and barely know they're on. The only thing to be careful of, though, is that you place them directly on the ear, without any of the cup extending beyond the back of the ear's outside 'lip'. If you do, you'll get a slight cycling hiss, which I presume is from the noise-canceling mechanism. But place them carefully and correctly directly on the ear and you'll get high quality sound in a silent environment you only dreamt was possible.