sorry i have to disagree here. i am using a pair of zbt's in church. my guess is its seasoned for more than 5 years at least. they have the super seasoned look on them, complete with dirt build up and a hint of finish corrosion.
but they sound excellent and serve the purpose. very crispy, can be both loud and soft when needed.
but im also guessing, that a brand new one would sound comparably sucky as opposed to seasoned ones =D
anyway, do check out the other brands made available by the other people who bring in music equipment in sg too. bosphorus and turkish.