I had one, but gave it away. The one I'd love to get is the HZ-600 'SD' one, sounds like a Roland Alpha-Juno 1.
Casio synths were stunningly good and really easy to use. So is a DX7, all that nonsense spouted about 'needing programming skills' etc. Most of the time you only alter a few parameters. CZ-1 is a beautiful synth to use.
David.