If the question is:
What is the best control for mold machining?
Then:
http://www.numeryx.com/cnc/index.htm
Is the best. Can be retrofitted on nearly any CNC machine.
Can double in most cases, and even quaduple feed rates that OEM controls deliver.
It's impossible to believe until you see the motion control...
You can also check out an older version of the same control:
http://www.numatix.com/
Sincerely,
Scott_bob