Digital BW, The Print

Hello. I have been using the MIS UT-R2 inks with the R220 with great 
results. The question I have is; should I purchase the CFS from MIS or 
refill the cartridges? I have read that some people have had problems 
with CIS systems. Has anyone used MIS inks with a different brand CIS 
system? Are the MIS cartridges difficult to refill? Any comments or 
advice is appreciated. Thanks in advance.

Francis