From a KORG point of view they sound fine, but it's not something I'd be looking to buy as the keyboards already got all this covered.

The Shakuhachi sound however is the same as one I uploaded to KORG Forums ages ago in M3 and OASYS format for free. The original sound comes from an Emulator and was heavily used by the Band Enigma who made this factory preset famous world wide.

This is a well known sound and it's available for free from countless websites.

[This message has been edited by Irishacts (edited 12-28-2010).]