Digital BW, The Print

>The eboni black will make that much of a difference? 

Yes, a huge difference compared to the R200 stock ink.  


>Do I need to do anything  to use it?

Just put it in the printer and do a nozzle test.


>How does the 2400 with the stock ink set stack up against the 
>eboni black in the r220? 

Both are excellent, with a slight dmax advantage shifting back and
forth depending on paper.  For example, Eboni has better dmax on
Dourian and Photorag, 2400-K is better on VFA.

Another option (I think someone mentioned it) is using an R2 ink set
in the R220 (if you don't mind staying with letter size prints).  This
will allow full ink printing as well as BO.  It comes in Warm and
Neutral flavors, but is also possible to make a variable tone set with
them.

Regards,
Clayton


Info on black and white digital printing at    
http://www.cjcom.net/digiprnarts.htm