The whole HZ600 thing is a mystery; I got it second hand with no manual! Programming it is very easy, and you can achieve very warm retro sound (you can even get a pretty good 303 sound out of it!)
Only get one if you are looking for some origionality from your tunes. It look quite retro (80's) and has nice feeling buttons (ooh, kinky!)
Comments About the Sounds:
Very warm analogue sound, sounds very retro.