I'm one of the dorfs that uses OEM branded ink in my Canon, here is why.
On my last printers, also Canon's, I started using Staples brand ink. Shortly thereafter the print head clogged irreparably. It happened on both the printers. The replacement head was like $65 so obviously I just tossed the printers.
While it may or may not have been the aftermarkets inks fault, I like my iP400 enough to spend an extra buck or few for Canon ink. The key here is that I only reink perhaps 2 or 3 times over the entire year.
If I am not mistaken it is either Epson or Canon that senses the use of "non-oem" carts and asked the user to OK their use and indicates using them voids the warranty at which point the printer writes something to its flash memory that lets service people know.
That may or may not be true but based on all the other shenanigans printer manufacturers pull, I would not at all be surprised.
What is sickening is that Kodak recently estimated that printer ink sells for between $4,000 and $5,000 a gallon. That should be illegal.
We have this new store that opened here call ?Cartridge World?, suppose to be ?professional? reinkers, franchised I think. What a joke. They charge 50-60% of retail on a new OEM cart just to reink and then people report serious issues that are dismissed when taken back to the store. I stopped in once and it seemed their game was to sell people their generic house brand of ink cart and if that failed, to sell them OEM at full retail. Most people are so ignorant they go for it.
I had them quote some toner refills and they were $30 *higher* than buying brand new ones off the web. Crazy.