Digital BW, The Print

I have not had the need to calibrate my system with software such as Monaco
EZColor because my results have been quite good without it.  I am however
considering buying ImagePrint in order to get neutral B&W with my 2200.  The
Luminous Landscape web site in their review of Imageprint suggests that
using ImagePrint without first calibration ones system is a waste of money.
The way I understand the function of a RIP, it replaces the existing color
management process/drivers for the printer.
So my question is, do I really need to also spend the money for the Monaco
or equivalent software?
Mike