After being deep into CIS for a couple months now I have some strong opinions...
especially that most "clogging" reports are really "air leak" problems. It is essential that the cartridges be seated fully and that the ink tubes be securely fastened at both ends.
I guess i am not qualified to really discuss this, since i have NEVER had a clog - the 1800 just hums along like a dream on the InkJetFly system and has never missed a beat in about 700 11x17's.
I believe there are 4 or 5 really good CIS systems out there, and all are very simple to use - BUT they are different and it seems that users sort of blank the mind when first using them - fear of a problem makes a problem, and sometimes some incredibly foolish things are done during installation that could easily be avoided by a bit of thought, some inet research, or a quick email to the company (most of these companies have really good support response - if they do not, avoid them like the plaque! )
Leo will hate me, and some of you will suspect wierd things, but i need to say this anyhow: i bugged Leo so much that he finally sent me a prototype CANON CIS to experiment with as he is so very busy on another stellular (sp) project that Canon has been pushed to the side long time now.
InkJetFly has a fantastic CIS for the i9900 (and related) !!!!! I have worked out every bug i could find and have run near 200 prints through it without a hitch now!!! Look for a CANON CIS in the next 2-3 months max!!!
I am so durn happy now! both printers hum along, never need "cartridges", print for cheap - but give excellent results (great color, good durability expectations, easy to use).
Sure, there will be minor ink glitches coming i am certain - always has been when using cartridges, so i expect them with the CIS - no printer runs forever without a screw up. But when one happens I will fixie with a little help from my friends - part of the business.
Say what you want, think what you want - i am in heaven... and NO, i am getting nothing for this "review", in fact Leo will be quite upset with me as he instructed me to NOT publish review or make an announcement - as i said he is into some new and exciting stuff. I cannot just sit quiet though, do not think that is fair to the Canon users

and this is not really a review
finally: i spray all with Premier Art Shield... 9000 reasons to do it, in my opinion it foolish not to.
pps: besides great success with IJF inks on matte, i have now made a profile for semi-gloss that is giving beautiful results!!!