Hi Shamdasani
I'm not sure about the current Koetsu Black but the early ones were not made by Koetsu. For the money you'd be better off buying a used Red Signature circa 1990 and getting it re-tipped at Expert Stylus. I have in my collection of cartridges a 1987 Rosewood/Red Sig as well as a 2004 Rosewood/Red Sig and the early one has more of that big Koetsu 'sound'.
A current Black and used Red Sig must be about the same price by now.