Man I wish this had been available when I got my i9900.
I have not seen anything really fade when properly framed (my oldest stuff done with it is only a year and half though.)
But if you don't protect the 9900 prints with their normal dye-based inks the prints if exposed to say 8 hours of direct sunlight each day will fade badly in 2-3 months on Canon paper.
It also has mega short term shifts with any non-Canon paper I've tried. You fiddle with the profiles, get it looking good with the 3rd party paper, 2 months later the prints look all yellow.
Still love the 9900 though, this 9500 is sure to be a keeper. No clogs, no destroyed/damaged prints, no real color problems as long as I stick with Canon paper, etc, etc.. in the time I've had my 9900, worlds better then HP I had before.