Pros: clear, detailed and balanced sound, light and comfortable
Cons: annoying cord noise, not so easy to place them in ears
Bought these in-ear headphones as replacement for my Sennheiser CX300 II. First impression - average (OK) design, stylish cloth covered cord and "the magic" foam tips. At the beginning was bit tricky to make them fit inside ears. Another annoying issue - cord makes rustling and scrapping sound when it touches to anything. As well TDK EB900 are bit longer than Sennheiser CX300 and sleeping with them are not comfortable at all.
Regarding sound quality they are well ballanced and has quite clear, more detailed soundstage than CX300. I found EB900 are especially good for live jazz and blues records.
But for rock music I better prefer Sennheiser CX300.
The "magic" foam tips making good job to isolate ambience. Even on jet plane they are doing their job well (better than Sennheiser!) Bit scary on the streets as isolation is "too good" to miss the crazy bikers.