PRICE makes purchasing this cartridge an easy decision. Here you have TWO cartridges, each rated for about 2100 pages (I just installed a new cartridge that works great, but I'm nowhere near capacity), or you can use ONE Canon-branded cartridge - with the same page rating – buy for FOUR. ONCE SO MUCH. The cartridge works great, is inexpensive and is 4 times the price of a well-known brand.