Summary: I have used the Lexmark 105XL Black Cartridge in my Lexmark Pro 905 Multi-function Printer for the last 3 months in my home office after giving my earlier Lexmark S605, which used a Lexmark 100XL Black Cartridge to my son. The XL105 advertises a 500 page yield for the cartridge. I usually get, on average, 400 to 450 pages based on my black ink page coverage of mixed draft to high quality output on the Pro 905 printer.
Pros: Price for yield
Cons: Onlyused in a few Lexmark printers such as Pro901, Pro905, Pro805.
Summary: It goes without saying that Best Buy had this on sale for $3.95 (normally $4.95) and it's a no-brainer for us that own a Lexmark printer. 500 Copies for $3.95....ummmm let's see...that's 0.79 cents a copy. Which is a whole lot better than taking your needs to a local copy center. Thanks Best Buy.
Summary: THESE ARE NOT ORIGINAL LEXMARK AND MINE HAS LEAKED A LOT, AND PROBABLY RUINED PRINTER, PROBABLY VOIDS WARRANTY (NOT SURE YET). So far I have only used the black, and will not even try the colors.