Summary: For people who want to suppress unwanted noise (like the drone of jet engines) but have little space (like the seats in coach-class jets), this little sucker is for you. It cuts out almost all outside noise, can plug into i-pods or airplane movie jacks and give you crystal clear sound. The single AAA battery that drives it lasts much longer than the double AAA batteries that I used to use with my Brookstone sound suppressors.
Summary: Excellent quality sound for a reasonable amount of money. The build quality comes in for some criticism, you can't have everything and good sound as well, well you can if you want to pay 3 or 4 times as much. However, does 3or4 times cost equal 3or4 times better in all respects, you will have to judge for yourself. While writing this I am listening to a Beethoven Symphony with these headphones and am enjoying the scale and dynamics of the music.
Pros: Very good quality in ear head phone - excellent noise cancellation - it is possible to simply relax and enjoy a very musical experience
Cons: slight hiss on occasions but not really audible when listening to music. I think these headphones are slightly unforgiving with old or not so great recordings. I personally don't find this a problem