I have experienced some slight problems in having my Canon Pixma Pro 9000 Mark II Inkjet Printer recognize some generic ink cartridges and decided from now on to use only OEM ink. Additionally, the OEM inks seem not to clog the inkjets even with only occasional use.
I ordered an 8-pack of CLI-8 inks from Canon at $110 U.S. Dollars. Then I saw the same inks for $82 USD from B&H in New York City. At first I was miffed but realized that Canon gave me about $75 USD worth of Canon paper
(100 sheets 4x6 inch glossy, 50 sheets 8.5 x 11 inch semi-gloss and the Canon Pro Paper and The Pro Paper Sampler of 20 sheets of Luster, Platinum Glossy, Semi-gloss and Premium Matte).
I don't really mind the extra cost from Canon since I am getting something extra from the expenditure.