Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Noise cancelling? More like noise adding
Review: PRO: It's a decent set of headphones, IF you leave the "noise canceling" off. Sound quality is better than some other cheap headphones I have used. The in-ear design does a reasonable job at blocking outside noise.CON: The "noise cancellation" feature is a total joke. For all I can tell, it doesn't eliminate any noise. It actually ADDS noise. A LOT of it. As other reviewers have pointed out, the moment you turn on noise cancellation, you hear a very noticeable, annoying hiss. At the same time, the volume of the music goes up. Also, just as someone else has already pointed out, the battery compartment, which also contains the noise on/off switch, is really bulky.
