About me, well, I'm facing a problem that sometimes, instead of the ink, air flows through the pipes.... In other words, instead of continuous ink, there's a medium sized air bracket that flows inside the tubes. Well, I don't know of a permanent solution so far.
Its shown, in the pic below:
But what I do is... As long as there is ink going inside the cartridge inside the printer, (I mean, as long as the air bracket is far away from the cartridge inside), I continue using it...
And when the air bracket in the pipes is close to the cartridge inside (as seen in the pic above), I just initiate "Deep Cleaning" from the Canon My Printer Menu. That flows some ink and clears the air bracket in the pipes.
Then, the printer can be used again with all its colors.
Of course, I admit its a hassle, but the cost benefits are huge anyways, for the kind of system.
Of course, there will be a certain reliability factor, but its anyways not too risky in my opinion.
And you won't think twice even before printing pics.
So far, around 2 or so years have passed and I'm still using it. And openly, including photo prints, huge documents, e books from internet, etc, etc.
And I've only purchased 1 bottle of cyan, yellow & magenta each and 2 of Black, total 5 bottles, and they're still not empty.