Thanks for your replies.
Our needs are purely to speed up output time and increase output size for postscript files such as posters and architectural drawings.
We hit a problem with a 4 meter postscript file, it appears the resolution is dropped significantly - making the output unreadable. I assume this to be a memory issue with the printer.
Simulating press conditions is not a requirement.
Our needs would be:
Output long postscript documents - over 4 meters
Decrease output time - drag drop queue
Nesting
Uses standard ICC profiles - our media supplier makes our profiles, so we don't want to go back an remake profiles if possible.
How future proof is eXpress? - As we are likely to upgrade our printer in a few years time, and not always want to purchase new software, will the eXpress be updated to support new printers in years the come?