CrunchGear: "There are a few ways to to get excellent audio out of a pair of headphones. You can have excellent components or a tight, close fit or special electronics. Or, better yet, you can have all three. I was lucky enough to be able to try three types of custom earphones/earbuds and am please to report that if you have the cash they’re definitely a great way to listen to music.
I tested three distinct models from JH Audio, Ultimate Ears, and Etymotic. All of these buds were custom molded for my ear, a process that is, at the very least, undeniably weird."