I haven't personally heard the ZX2, but the ZX1 thoroughly irritated me because it was so obviously and blatantly synthetic in its presentation of music. So, for me, the S-Master chip majorly misses the target of natural and realistic music reproduction. But, evidently, there are many who feel otherwise. Everyone's experience of anything in life is, by definition, subjective, so... All part of life's rich tapestry, etc. etc.