Summary: I'm going to flat out say it...sound wise these things are nearly best I've used, and I've used quite a few. If you're an audiophile get the Audio Technica M50's. If you want excellent sound quality at an amazing price get these. Nothing is subdued, giving them extremely accurate sound, though that does mean if there is any edge to a piece of music you hear that too. Along with the great sound, they are the absolute most comfortable headphones I've ever used.
Excerpt: Being a sound engineer for 28 years has given me a really solid background to compare the PYLE Hi Fi Noise canceling headphones to the many different pairs I've worked with over the years. These Headphones are unbelievable with sound quality and comfort. I was blown away by the clarity and flat frequency response. A flat frequency response is the ideal sweet spot an audio engineer strives for, especially with the final mix and mastering.
Summary: When I picked them up for $30, I was not expecting much, but when I tried them on It was better than I thought. These headphones offer good noise cancellation for the price! I couldn't hear pretty much anything.
The only con is the material which is plastic, but its fine if you take good care of them.
Pros: Noise Cancellation, OK Sound Quality, Comfort