Summary: I bought this headphone last year from a fellow head-fier. Unfortunately one of the channels recently died. I suspect this is a cable issue as it was recabled by the first owner. Eventhough at that time I was already looking for a better closed headphone to replace them, I must say I will regret the CD900ST. This is a very capable headphone for the money.
As a studio tool you know what to expect, and the CD900ST does deliver a very well balanced and smooth sound.
Pros: Good balance, intimate soundstage, easy to drive
Cons: Slightly on the bright side, not extremely resolving