That sounds sweet! My Clarion has flash memory, but can only hold 6-8 CDs. I wish it was expandable, but it's not.
EDIT: I just googled the Z1. Holy crap! That thing is SAWEET! I'd love to have something that flashy, but 'tis a bit pricey for me. It's cool that the drive can also store the nav system's entire atlas database.