Rating: 
Summary: Good, not great
Review: These earphones do what they're supposed to do: mostly isolate outside noises and deliver good quality sound at a low cost. The base is very good for ear bud/phone style speakers which explains the popularity of the Sony EX51 & EX71s.That said, I'm not that pleased with their fit. I've spent the better part of a week fiddling back & forth between the different cushions and finally decided that for my ears I have to use the small size. The catch is that the smalls don't fit *that* well but the next size up is too large to get a good insertion. All in all I'm satisfied of their value but would recommend seeing if you can find a friend with either these or the EX71s to see what you think of having them in your ears before purchasing. After using these for a week I can see them being used on the bus/plane, but for everyday listening I'm going to keep on using the Apple iPod earphones or just use a much better sounding set of actual headphones for about the same money.
Rating: 
Summary: Awesome headphones
Review: They fit my ears perfectly right out of the box. Very comfortable, sound quality is amazing. They almost completely block external noise. I did not experience any of the sound or volume issues mentioned in other reviews.
My only complaint is that the carrying case is awful. I used the carrying case from a set of older and far cheaper sony headphones.
I have only possessed these for 2 days so I have no idea about durability.
Rating: 
Summary: Don't move
Review: When these in-ear headphones are properly installed (and getting them in right is like an installation) the sound is amazing. I've heard parts of songs that I'd never heard before. But the headphones suffer from two massive flaws. The first is that if the headphones move the tiniest bit out of your ear canal, the sound quality plummets. This is a huge problem because the cord is so long that it is guaranteed to catch on something and jiggle the earbuds. Even when wrapped up and out of the way, the cord will respond to the slightest movement and pop the earbuds out of your ears. This is extraordinarily frustrating, all the more so because the sound is so good. Even worse, because these are in-ear, whenver the cord moves it makes a racket. I do NOT recommend these headphones to active people or to people that plan on moving much at all. If, however, you don't plan on moving much with these headphones, you're golden. Also note: that little case that comes with them should be used all the time; the earbud pieces will come off in your bag or pocket and the case helps prevent that. It also helps prevent just whipping out your iPod and listening, since you have to undo the case and store it, but that's the least of your problems with these headphones.
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