Digital BW, The Print

I downloaded the demo of this RIP and will be setting it up in the next few 
days for both my 2200 and eventually the 9600.  It looks interesting -- I 
imagine that, like ImagePrint, I would use it primamrily for B&W if I get it, as I'm 
satisfied w. the color images from Ultrachrome printers.  Any current users 
have any feedback on it generally?

Specifically, I found this statement on their website to be interesting:

"ColorBurst utilizes Total Ink Limit and Black Preservation in pre-configured 
environments [note: they call profiles "environments."] The Black Preservation 
feature allows ColorBurst to achieve a deep rich black by not limiting the 
Black channel in relation to the Total Ink Limit. This feature enables users to 
get a great black with Epson's Photo Black cartridge even on Matte and Fine 
Art papers. "

Is this actually true?  I thought the photo black/matte black switching was 
necessary not only b/c of better blacks when using photo black w. glossy and 
matte black w. matte papers, but also because of "adherence" problems -- i.e., 
that using photo black ink on matte paper will result in "ruboff."  (Or, is it only 
using matte black on glossy papers that will reuslt in ruboff?  I assumed the 
problem ran in both directions...)

Thoughts on this RIP generally or on the quote above?