Digital BW, The Print

I am thinking of getting a set of Piezography inks for B&W printing on 
my Epson 1800.  Has anyone had any experience with these inks on that 
printer?  Specifically, did they improve your prints noticeably?  Is it 
as easy as they claim to move back and forth between the Piezography 
cartridges for B&W and the Epson cartridges for clor printing? So far 
Quadtone RIP is giving me pretty good results in B&W with the regular 
set of Epson inks.