Digital BW, The Print

Hi,
   I am setting up a new Epson 1400 to use the MIS UT-14 inkset and
MIS cartridges.  I am wondering whether or not to first test the
printer with the Epson cartridges that came with it. I have read
suggestions that this is a good idea, but I wonder if anyone has
really had problems with a new printer and was helped by first testing
with the Epson cartridges.  It seems to me that ink mixing problems
might be avoided by going straight to the UT-14 cartridges, especially
with the Y-position, which is used for GLOP in UT-14.  Also, all
things being equal, I would prefer to keep the Epson cartridges
sealed, rather than using up half the contents priming the printer. 
I'm shocked at how small these cartridges are!

Thanks for any suggestions,
David