colin,
so far, i have had to only replace one cart, they don't depleat at the same rate.
with some carefully shopping one can find the inks at a fairly nice reduction in retail price, and i am talking about the HP inks not third party ones.
i was very surprised at how netural a black and white print was when using this print. I have been running some test with another smaller printer with only black inks and have been pleased with those, but it wasn't helpful with my learning about icc profiles, etc.
try running this test on your printer when you get it, or in fact on any printer you get
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it is an incrediable test
here are the directions for reading the test
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there is a yahoo group called
9100series@yahoo.com
they are very helpful