Excellent, with high-quality noise-cancelling,
This review is from: Sony MDRNC22 In Ear Noise Cancelling Headphones With Monitor Switch To Hear Surround Sound (Electronics)
I bought these earphones a little hesitantly, after reading about the hiss in other reviews. Do not be dissuaded, however. There is a slight hiss when you switch noise-cancelling on, but anybody who complains about this can't have given these earphones a fair go, as the "hiss" is only audible in a quiet, almost silent environment, when you wouldn't be using it anyway.
The sound-qualiy is excellent.
The monitor switch (not made clear on the description) turns off the noise-cancellation while you hold it and plays what is outside through the earphones. This will cut off whatever you are listening to (though it will resume as soon as you release the button) and is extremely useful. They also fit perfectly in my ear, with the selection of buds, acting as excellent passive noise-isolation in their own right and penetrate deep into my head, allowing for a crisp and clear sound.
I would highly recommend these earphones.