Digital BW, The Print

I recently bought a R220 and ordered an MIS cartridge set in order to
print what I hoped would be quality B&W prints.  When I installed the
cartridges the LC cartridge would not work (covered in another post)
since then two more people have posted to this forum with cartriges
from MIS that will not work on these printers.  
Does MIS have quality control problems?  If I need to reseat the
cartrige they should include the cartridge setter in the order.  This
has discouraged me with the whole project.  MIS resonse to my problem
was reseat the cartrige. ( I explained in my problem report that this
had been done )  Is MIS the only supplier available?  Maybe they just
want to sell CIS.