Summary: I've gone back and re-ripped all of my songs at 192kps to take full advantage of what these earphones have to offer. I'm going to qualify my post by saying that I listen almost exclusively to an iRiver Clix. Which player you have is IMPORTANT. They each have a unique sound built in. My player has a graphic equalizer, so I am not stuck with factory presets. I'll tell you a little about my odyssey. I bought a Clix and a U10 in December.
Summary: this little gadget is wonderful. i can turn it full blast and be in a world of my own. note if volume is at its max u won't here anyone trying to talk to u. i did notice extra sound effects i normally wouldn't from an regular earphones. u can hear to in movies words ur ear would not dare to listen. also the earplugs at times do feel uncomfortable this is because they can be to tight and having them earphones plug in for a long length of time can annoy the ears.