The C900 looks like an interesting machine, the Z8001 being an early RISC CPU, albeit one with a lot of flaws.
The video chip is actually the same as the C128's video chip (
http://en.wikipedia.org/wiki/MOS_Technology_8563) but presumably running at a faster speed to generate the 72Hz 1024x800 display. Despite having its own blitter, it was probably not a patch on the Amiga's graphics chip.
The line would have provided Commodore with a premium professional workstation line of products, but they were right to not spread themselves too thinly. They needed to get the Amiga into new configurations far quicker than they eventually did.
