Excerpt: I bought these earphones after losing a pair of in ear sony headphones (MDREX33). I find in ear headphones a great way to block out exterior sound without having to wear big bulky headphones. I was very impressed with my sony earphones, and when I bought these Sennheiser ones I was even happier. They are very loud, and never seem to crackle even at the highest of volumes.
Pros: Loud, easy to transport
Cons: Price, even though they are worth the money, its a lot for a pair of headphones .
Excerpt: These headphones are probabably the best in-ear headphones that I have ever used. Sennheiser calls this new type of headphone "ear canal headphones". So what's so special about these phones ? Well the shape of these headphones enable them to block out noise from outside your ear. They basically act as earplugs. In-ear headphones usually come free with your mp3 player and get thrown out quick. These in-ear headphones won't suffer the same fate.
Pros: small, great sound , great external noise reduction